Alternator replacement, car now dead - Rennlist - Porsche Discussion Forums


Alternator replacement, car now dead


Old 11-21-2017, 05:10 PM
New User
Thread Starter
Join Date: Sep 2017
Posts: 1
Question Alternator replacement, car now dead

Went to replace 90 Amp alternator on base 1984 944 with new re-manufactured alternator. Finished up, put in key, got a wining sound, car did not crank. Talked to technical support for alternator company, said to loosen top bracket bolt holding alternator in place, as it is possible to over tighten. Did so, put 35 lbs of torque on bolt. Tried restart, car wined, then dead, no lights on dash. Possibility of frying any electrical components? Any ideas? HELP
Springskeen is offline  
Reply With Quote
Old 11-22-2017, 09:49 AM
Rennlist Member
Join Date: Oct 2006
Location: Porterville, Ca.
Posts: 1,378

Start with a known (fully) charged battery. If not... then no telling.
joejoe is offline  
Reply With Quote
Old 11-22-2017, 02:39 PM
Coloradoguy's Avatar
Join Date: Nov 2017
Location: Aurora, CO
Posts: 49

Simple stuff first: Good battery? Fuses blown? Wires to alternator hooked up properly.
Coloradoguy is offline  
Reply With Quote
Old 12-01-2017, 01:08 AM
Rennlist Member
Join Date: Apr 2011
Posts: 1,744

Did you hear the starter drive try to engage the flywheel? sounds like the starter drive unit did not extend into the flywheel. The way how Porsche wires up their starters is kinda weird to me. But it seems to work. Double check your alternator wiring...and recharge the battery up to 13.2 volts before doing much more.(max voltage for any 12 volt lead acid battery...this should be attainable with a 24 + hour charge. hope this helps some. If this doesn't work take the battery down to AutoZone and have them check it out. Their digital load tester is pretty good..and will tell you if the battery is DOA or just needs a recharge.
Tiger03447 is offline  
Reply With Quote
Old 12-27-2017, 03:06 AM
william_b_noble's Avatar
Join Date: Mar 2004
Location: Calif
Posts: 1,154

a stuck starter solenoid will do exactly what you report - if it was working before AND you did not touch the starter or any other wiring, then it would be odd, but if you touched the wiring, check all that you touched. for alternator change there is only the wires that actually go to the alternator that you need to touch - disconnect battery ground lead, R&R alternator, reconnect ground lead. If you moved the battery hot lead you could have lost one of the multiple wires connected at the battery
william_b_noble is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
928 Forum
05-17-2017 09:36 AM
911 Forum
01-10-2017 11:57 PM
928 Forum
09-01-2016 01:58 PM
997 Forum
08-22-2016 01:56 PM
911 Forum
08-11-2016 11:34 PM

Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -3. The time now is 07:22 PM.

Copyright ę 1998 - 2017 We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: