 Alternator light on with key off |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| Joec |
 Aug 26 2021, 12:35 PM
Post
#1
|
|
Newbie  Group: Members Posts: 22 Joined: 26-April 21 From: Delta, BC Member No.: 25,484 Region Association: None  |
On my non running 74 2.0, the alternator light is on all the time. If I turn on the key it goes out. Any ideas?
|
   |
 
|
  |
Replies
| GregAmy |
Aug 27 2021, 02:34 PM
Post
#2
|
|
Advanced Member Group: Members Posts: 2,505 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States 
|
^^^ That would follow. Diode pops, dropping the alternator side to battery voltage, and with the key is off it grounds that other side through whatever path it can find. Then with key on, both sides see battery voltage so light goes off.
Easiest way to tell is to see if the blue wire has +12V (battery voltage) with the key off. It should not. |
|
|
|
Posts in this topic
Joec Alternator light on with key off Aug 26 2021, 12:35 PM
Joec Could it be the relay box? Aug 26 2021, 03:37 PM GregAmy One side of the lamp goes to the alternator (via t... Aug 26 2021, 03:48 PM Pops71Por Had similar issue and the voltage regulator had we... Aug 26 2021, 03:49 PM Dave_Darling I believe the typical cause of this is a diode in ... Aug 27 2021, 02:28 PM Joec Of course the blue wire has power with the key off... Aug 30 2021, 01:01 PM Dave_Darling Replaceable part if you're up to doing an alte... Aug 31 2021, 09:36 PM whiterabbit I recently dealt with this same issue. Turned out ... Sep 1 2021, 07:47 AM
914e Here is a link on replacing a bad diode.
Any of th... Sep 1 2021, 09:23 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th July 2025 - 04:55 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.