Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

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)

Alternator Testing... Need advice

Recommended Posts

Can I use the alternator with the free-wheeling pulley for the manual cars on my tiptronic that usually has the fixed pulley? I've been offered a refurbished Bosch free-wheeling pulley one for half the price of one with the fixed pulley due to surplus stock. If not can I swap the pulleys over from my existing alternator to the new one?

Link to comment
Share on other sites

Agree with JFP as I just went through this myself a few months ago and he was very helpful in helping me get it sorted. The cable harness from the alternator to the starter is known as a weakness in the 996 and 997s... and this especially manifests itself in extreme temperatures like it did to me this summer when it was 100+ F for multiple days.

To Lograys's point about testing (Logray, like JFP, is also one of the more knowledgable around here), just be careful of having your alternator tested at a place like Napa or Autozone. I replaced my voltage regulator in my alternator since it seemed like it was just that....and then had the alternator tested there. They passed the alternator saying it was fine and I assumed that the voltage regulator was all it was bercause a lot of the problems went away. However they didn't all go away....it turned out that the alternator wasn't working 100% at all RPM levels and I continued to have minor issues until I replaced the alternator. The alternator is pretty easy to get to, but not always very fun to get in and out. In the future I will probably just bite the bullet and spend the extra $300 to replace the whole alternator at first problem isolated to it. My car had 90K+ miles on it anyway with the original alternator, so throwing a new one in there probably wasn't the worst thing in the world.

Edited by ferrugia
Link to comment
Share on other sites

I've checked the voltages at different points - when the alternator is pushing out 13.8v, it reads 13.8v at the engine bay power point and the cable connection next to the tip box and 13.65v at the battery so there is a slight voltage difference.

Voltage difference from +ve battery terminal to engine bay power point is about 0.1v. Resistance from +ve battery lead to alternator is 0.2 ohms. There is no resistance from alternator body to body ground.

Link to comment
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.

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.