Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Sep 2006
Location: Houston
Posts: 19
Garage
Alternator Issue?

84 Cab, 3.2 Stock
Issue is that Alternator light stays on but indicates charging.

Had a bad batter that failed test, replaced with new battery:
New Battery:
12.7 Volts

Conditions:
Key Off: Alt Light Off
Key On: (Not Started) Alt Light Off
Engine Started: Fast Idle @ 1K RPM = 13.85 volts Alt light Off
After about 1 minute Alt light comes on.
AT 2K RPM 13.85 volts Alt light remains on.
Restart Engine: 700 RPM, 12.8 volts Alt light On
@2K RPM, 13.6 volts Alt light On
Back to 700 RPM idle 13.6 volts Alt light on.

Alternator rebuilt about 2 years ago, very little usage since then.
Alt light would come on with the old / bad battery also.

Trouble shooting seems to drive me to pull the alternator out enough to check wiring connections at the back but Iíve R&Ríd alternators before and itís not that easy so wanted a sanity check before undertaking that.
Tried to follow troubleshooting instructions and previous threads but this seems to differ or I'm missing the obvious.
Is this sounding like a regulator problem?
Any easy suggestions or do I need to get the Alternator tested?
I have not tested the transmission ground strap yet, not sure of the priority of that.

__________________
Doug
Old 01-06-2020, 01:10 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
T77911S's Avatar
 
Join Date: Oct 2006
Location: MYR S.C.
Posts: 13,151
did you connect the ground strap to the alt when you replaced it.
check/clean the ground from the body to the tranny.
also make sure the ground at the battery is clean

once all that is done take the car to some place like advance, they can test the alt with it on the engine.
__________________
86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 01-07-2020, 03:56 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Sep 2006
Location: Houston
Posts: 19
Garage
Thanks T77911S
I'll do grounds today, Probably a couple of days before I get it out to check the Alternator. That requires a no rain verification down here in Miami.
__________________
Doug
Old 01-07-2020, 06:57 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Sep 2006
Location: Houston
Posts: 19
Garage
Problem solved: 1st problem was failing diodes. Taken care of. 2nd issue was a broken wire behind cluster and that drove a very dim lighting of the bulb. Now the Battery light comes on when it's supposed to, goes out when it's supposed to and the alternator charges appropriately.
I had professional help.

__________________
Doug
Old 01-09-2020, 11:20 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 08:54 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.