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)
gordonmacwilliam

Battery switch for '96 993?

Recommended Posts

I have been recently retired and now drive less than 1,000 miles per year. Lately I have been recharging the batteries on my 944S and 993 weekly. I installed a battery switch on the 944S so that I would not have to charge this battery, but was leery of installing one on the '96 993 as I was unsure if the lack of power over a long period would have adverse affects on the electronics such as the ignition disabling mechanism. Does anyone know if installing a battery switch would be a problem for this vehicle?

Share this post


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

You DME will reset, which you need to allow for when state inspection is on the horizon; but why not just put a good battery maintainer on it and leave it connected? I do this for very long periods of time with no problems, you just disconnect and start the car...................

Share this post


Link to post
Share on other sites

Thank you for your response, JFP. I apologize for not getting back sooner.

Here in Jacksonville, Florida, vehicle inspections were discontinued more than a decade ago, so fortunately, this is not a problem for me.

I have an (admittedly old) Schumacher (Sears) 1.5 amp on-board battery maintainer. The output during charging is only 0.6 amps (instead of the advertised 1.5) which I can live with. The output when the red charged light is on is 0.4 amps which I cannot, because this translates to almost 10 amp-hours each day overcharging the battery. I had been charging the battery 24-hours prior to use which was a pain.

I had to fix the ubiquitous horn problem, so I left the battery disconnected for a week. Since I had no problem when the battery was reconnected, I installed a battery switch. Getting to the switch handle under the floor mat would have been yet another pain, so I installed a bolt through the battery switch handle and made a notched lever handle that would insert through a drilled hole in the floor mat and grab the bolt. The trunk light indicated whether the battery switch is engaged or not.

Edited by gordonmacwilliam

Share this post


Link to post
Share on other sites

Not to sound overly critical, but wouldn’t have been both easier, and less "agricultural", to just buy a decent maintainer?

Share this post


Link to post
Share on other sites

See Battery in or out below....I have switches on several cars and they work fine..the only thing I have to do is reset the clock. I have disconnected and reconnected the battery in my 993 as per the owners manual for long term storage with no problem except the clock so I don't know why you couldn't use a disconnect...

Share this post


Link to post
Share on other sites

The reasons not to disconnect the battery are fairly well documented; Excellence magazine recently did a detailed article on some of the issues it can lead to, particularly with 911 variants. My personal favorite was the cars that lost fuel level calibration, resulting in having to drain the fuel tank, refill it with a precise amount of fuel, and then reset the dash gauge using a PST II/ PIWIS unit. Not exactly easy or fun...............

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

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.