Jump to content
×
×

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

When battery is dead the electrical system is down, as is the trunk for accessing battery.  

 

I have tried connecting positive to red fuse and negative to door arm.  I ran current using jump starter but could not get latch to open.  Does anyone have any other ideas to open truck, e.g. force lift?  Thanks in advance.

 

Is this also true for current year C4S?

 

Quote for 1999 911:  <<There should be a release cable under one of the headlights. You need to use something to fish it out. If you do a search at renntech.org you will find it.>>

 

Thanks

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

There are two emergency release cables.  One is for the front trunk lid and it is located underneath the passenger side headlight.  The only problem with that is getting to it, because if the trunk lid is not open you cannot release the headlight to get to it.  So you have to pull down the front passenger side wheel liner and reach up to find the cable.  The second emergency release cable is for the engine lid.  It is located underneath the drivers side tail light.  Put some painters tape on your bumper under the tail light and use a plastic wedge to expand the gap between the light and bumper.  Shine a light in the gap and you will see a cable that you can fish out with a coat hanger hook, or something with a hook on it.  That will open the engine lid where you can get to the jumper points in the engine bay.  With a good battery, connect to the jump points and that should enable you to get the trunk lid open.

 

And let me use this opportunity to make a strong recommendation - once you get the trunk lid open so you can access the battery, pop the headlight and locate the emergency release cable.  Then re-route the cable to just inside the front bumper tow hook plug.  When, not if, in the future you have to deal with a dead battery, pop the tow hook plug and there is the emergency release cable.

  • Upvote 1

Share this post


Link to post
Share on other sites

I second what DBjoe said. Reroute that front cable.

 

And I have seen batteries that sucked up the voltage from small jump boxes and didn't allow the car to activate the front release. Try a larger power source or charging the car for some time, if you can't get to the release cable.

  • Upvote 1

Share this post


Link to post
Share on other sites
Posted (edited)
13 hours ago, Loren said:

Exact model and year of your car, please?

This is first use of forum, so please excuse if my comments are out of order.

 

I just want to thank those who helped by answering and one who tried by note.  Between the contents of all the answers the trunk is open.

FYI, Major problem now - can’t charge dead battery on this new car (400 miles)???  I put a battery charger on for 24 hours and can’t get past ‘bty bad’.  (No reason to believe Charger is bad.  Any DIY ideas?)

 

Thanks and regards from Atlanta, GA. 

Edited by Vertical

Share this post


Link to post
Share on other sites

Is it a newer type AGM battery?  By experience, one day they work and the next day it is dead.  Probably has a broken cell inside the battery.  Time for a new battery.  Before disconnecting the battery cables, make sure you have your radio code if it requires one.

Share this post


Link to post
Share on other sites

Thanks, but I’m not checked out on ‘radio codes’?   You’re nor referring to Sirius code?  IAE no power... .  Do you think jump start attempt blew the battery or just sitting undriven 4 weeks.  It’s otherwise getting towed to the dealer=(

Share this post


Link to post
Share on other sites

2017 C4S, which I already sent.  Original problem resolved, trunk opened.  Howeve, next step of problem is dead battery!  This is a new car with only 400 miles.

Do you think jump start attempt blew the battery or just sitting undriven 4 weeks.  It’s otherwise getting towed to the dealer=(

Share this post


Link to post
Share on other sites

Jump starting the car rarely kills the battery, unless you hook up the jumper connections wrong (backwards), then all kinds of bad stuff happens.  If it won't charge then it is a bad battery.  It really doesn't matter that it was undriven for 4 weeks.  However, that length of time may result in a dead battery.  Some batteries just will not recover from being fully discharged for a length of time such as 4 weeks.  All depends on the battery type and current condition.  I don't understand why you don't just change out the battery without going to a dealer.  That's going to cost a fortune.  Any NAPA, AutoZone, O'Reillys can help you install a new battery.  Recommendation - get an AGM battery, H7 size.

  • Upvote 1

Share this post


Link to post
Share on other sites
Posted (edited)

I appreciate and understand your input.  While I’m not new to Porsche I am new to problems with them. This is my 4th, 2nd 911 but my wife gets one when I do (so 3rd 911.  She currently has a ‘16 Targa 4S, custom build.)

 

I buy new to avoid problems even though it costs more.  I know where it’s been and I’m fastidious with care.  This one is new, 400 miles and should be covered under warranty.  Heck, they ought to give me a new car after buying 8 of them there within~4 years.  I love them and am jonesing for a Turbo S2 but it’s a bit much on $$$.  (Wife won’t get a T2; I’ll be lucky if I do’-)

 

Unbelievable, but I had a Porsche trickle charger on it while it sat 4 weeks - had it set to ‘off,’ which caused all these problems.  I could have pooped a porcupine!  So, now it gets towed and I’m nervous as the long tail cat that they’ll send some dunce to pick it up with an old bent dodge pickup with crane... .

 

Any and all tips appreciated.

Edited by Vertical

Share this post


Link to post
Share on other sites
On 3/1/2018 at 3:17 PM, Vertical said:

I appreciate and understand your input.  While I’m not new to Porsche I am new to problems with them. This is my 4th, 2nd 911 but my wife gets one when I do (so 3rd 911.  She currently has a ‘16 Targa 4S, custom build.)

 

I buy new to avoid problems even though it costs more.  I know where it’s been and I’m fastidious with care.  This one is new, 400 miles and should be covered under warranty.  Heck, they ought to give me a new car after buying 8 of them there within~4 years.  I love them and am jonesing for a Turbo S2 but it’s a bit much on $$$.  (Wife won’t get a T2; I’ll be lucky if I do’-)

 

Unbelievable, but I had a Porsche trickle charger on it while it sat 4 weeks - had it set to ‘off,’ which caused all these problems.  I could have pooped a porcupine!  So, now it gets towed and I’m nervous as the long tail cat that they’ll send some dunce to pick it up with an old bent dodge pickup with crane... .

 

Any and all tips appreciated.

 

Chances are you just have a bad battery, as someone else has mentioned sometimes these AGM batteries just die without warning so being on a trickle charger wouldn't made a difference either way.  That being said the newer cars with AGM batteries will not reliably work with a cigarette lighter style trickle/charger maintainer, you'll need to hard wire to the battery.  As long as you've called 1800Porsche you can expect to have someone that has been trained on these vehicles.

Share this post


Link to post
Share on other sites
Posted (edited)

As it turns out all of your points proved to be the case.  Dang, Is it also true the Porsche cigarette lighter won’t trickle charge?  I used to hard wire before I got into Porsches.

 

As it was indeed bad, dealer has now put in a new battery and run the relearning defaults and tested for parasitic drain... .  Happy again in unun land,)

 

Many thanks and regards.

Edited by Vertical

Share this post


Link to post
Share on other sites

Porsche’s were designed to use the cigarette lighter as a port to connect a quality battery maintainer (not a trickle charger).

  • Upvote 1

Share this post


Link to post
Share on other sites

I’m a little confused:  I thought a quality battery maintainer was a trickle charger by definition - releasing charge as battery depleted.

Also, this may be a nit but in my C4S there is no cigarette lighter per se.  instead, there is a dedicated power port on the side of the

passenger’s foot well.  It may (or not) be same specs/functions as lighter, or greater?  I’m not informed.

Share this post


Link to post
Share on other sites

The difference between a trickle charger and a battery maintainer is that a trickle charger constantly applies a charge, whether the battery is fully charged or not.

A battery maintainer, on the other hand, has circuitry that monitors the battery and charges only when the voltage has dropped below a preset level, thus preventing overcharging and damage.

 

When the battery maintainer, senses the voltage has dropped, a battery tender will resume charging. Because of this a battery maintainer can be left connected indefinitely. A trickle charger should be disconnected and reconnected occasionally, probably used for charging once or twice a month for a day. I do not recommend using trickle chargers since people tend to forget and leave them connected.

  • Upvote 1

Share this post


Link to post
Share on other sites

Then, unless I hear back the  battery maintenance  device sold by Porsche is intended to plug into power port as wired, not hard wired.

Share this post


Link to post
Share on other sites

The Porsche version of the CTEK battery maintainer comes with a cig lighter plug end

 

Porsche Charge-o-mat Pro Battery Maintainer and Charger

Share this post


Link to post
Share on other sites
2 hours ago, Loren said:

The difference between a trickle charger and a battery maintainer is that a trickle charger constantly applies a charge, whether the battery is fully charged or not.

A battery maintainer, on the other hand, has circuitry that monitors the battery and charges only when the voltage has dropped below a preset level, thus preventing overcharging and damage.

 

When the battery maintainer, senses the voltage has dropped, a battery tender will resume charging. Because of this a battery maintainer can be left connected indefinitely. A trickle charger should be disconnected and reconnected occasionally, probably used for charging once or twice a month for a day. I do not recommend using trickle chargers since people tend to forget and leave them connected.

 

Basically, ALL trickle chargers will eventually cook and kill the battery, while a battery maintainer can be left on indefinitely and will NEVER harm the battery.

Share this post


Link to post
Share on other sites
Posted (edited)

That’s the one I’ve got (Porsche’s battery maintainer, pictured), presumably will work on new Porsche battery (AG3)? vs. earlier post

that newer cars, with AG3 batteries had to be hard wired.  

 

(I’m caught in the middle of two opposing opinions.  I’ll let you two resolve your differences!) 

 

IMO, since Porsche made it for Porsche batteries and is still selling it to maintain their AG3 it will work, unless there’s something I’m missing.

 

Thanks for followup.

Edited by Vertical

Share this post


Link to post
Share on other sites
1 hour ago, Vertical said:

That’s the one I’ve got (Porsche’s battery maintainer, pictured), presumably will work on new Porsche battery (AG3)? vs. earlier post

that newer cars, with AG3 batteries had to be hard wired.  

 

(I’m caught in the middle of two opposing opinions.  I’ll let you two resolve your differences!) 

 

IMO, since Porsche made it for Porsche batteries and is still selling it to maintain their AG3 it will work, unless there’s something I’m missing.

 

Thanks for followup.

 

Not sure what you are referring to as an “AG3” battery, but I will assume you are talking about an AGM or Absorbed Glass Mat battery.  AGM batteries require a slightly higher final charge voltage compared to a conventional flooded celll battery, but they do not require hard wiring.  In any case, the lighter circuit in the car is wired to accommodate the use of a quality battery maintainer.  The Porsche unit is actually a CTEK, which has a special setting specifically for use with AGM batteries to accommodate the higher finish voltage, so it will work fine with an AGM battery.

  • Upvote 1

Share this post


Link to post
Share on other sites

Great!  Thanks for clarifying.  (Yes, I did mean AGM; my mind wandered to a variation of the Porsce GT3 monike... .  It charges you!)

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Jared Imapirate
      I am currently trying to repair my 2001 Boxster 2.7 as the coolant temperature gauge no longer reads and the coolant light is flashing at about 1 hz. The coolant temperature sensor pigtail had broken wires too close to the connector itself to effectively solder back together. I searched for several days and couldnt find anyone selling a specifically designated coolant temperature sensor pigtail, but the engine knock sensor pigtail seemed to fit. I installed that part and reconnected the wires with a good soldered connection and plugged everything in, unplugged the battery for about 10 minutes to reset the code, restarted the engine and was greeted with the same flashing light. The coolant temp sensor itself has been replaced, the coolant level is solid and the engine has been burped. Several times. Any thoughts?
    • By Loscano
      I purchased a 1999 Porsche Boxster 986 about a year ago and I'm having a few problems with the electrical accessories.  The top worked fine when I bought it, but now it won't work sometimes. The radio also turns on, then immediately off at startup, and it won' turn back on until a few minutes later either by itself, when I use turn signals, power windows, brake, or even just by itself. After the car is "warmed up", then it will stay on. Other things won't work right or not at all, such as the alarms for, ignition, door open, light switches, etc. The fuses are all fine, and I know the battery had been replaced right before I purchased it. I haven't checked the relay for the top, but I am about to do that now. I feel like there could be a single problem creating all these issues. Any help would be greatly helpful and appreciated! 
    • By Pkcayenne
      Hi cayenne 04 CTT weirdness the below list of functions was intermittent now nothing works 
       
      buttons on steering wheel 
      tiptromic button on steering wheel 
      wipers
      cruise control 
      pin out adjustment 
       
      all functionality on the steering wheel except it steers perfectly all fuses are good errors as attached any ideas was intermittent

    • By booe
      Hello!  
       
      I am running into some electrical issues that all happened at once.  Here are the items that I found not functioning:  Cluster Illumination, power seats, radio (PCM does not power on), engine lid switch (frunk works), HVAC (the screen is functioning, but not blowing any air).
       
      The car starts fine and runs.  I initially thought maybe the ignition switch was faulty, so I went ahead and replaced but nothing changed.  I have checked many fuses and they all look fine.  There are no trouble codes. 
       
      If it matters, this is the scenario when I noticed all the problems: I just finished driving about 70 miles with no problems. Park the car outside and it started to rain.  I needed to move the car so I got back in and noticed when I turned the light switch to the first notch, cluster did not illuminate but the headlights worked when I turned it to the next notch.  Then I started testing to find the other symptoms.  Everything was working on the drive I took a few hours before.  Though after the drive, I was messing with the light switch to see if the fog lights worked.  I never use them and for whatever reason I wanted to test if it worked, so I was turning the light switch way more than usual I guess.   I drive the car a few times a week as it is my main car.
       
      Thanks!
       
    • By Booboy
      Anyone experienced this scenario? 
      Upon turning ignition key,  heard a click, and had no electrical power to anything on car. After opening hood and looking around I grasped the positive battery cable and pulled / jiggled slightly to check connection from where it disappears into the  firewall (if you will) area, and all electrical power was restored... car started and everything fine? Next time I went to start car experienced the same scenario. My question is...where, what does positive battery cable connect to that would exhibit these symptoms. Thanks
×

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.