Seeking help with electrical problem |
|
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. |
|
Seeking help with electrical problem |
JoeSh |
Nov 25 2019, 11:49 AM
Post
#1
|
Newbie Group: Members Posts: 10 Joined: 11-September 03 From: Long Beach CA Member No.: 1,142 Region Association: Southern California |
Hi
My 73 2.0 914 has a few odd electrical probs I'm trying to fix. The most obvious is that it won't turn off when the lights are on and my foot is on the brake. Corrolary: lights on key on engine not running pressing brake primes fuel pump. What I know/have done: by pulling fuses narrowed it down to fuse 8 circuit. Oddly (to me) measured 8v on circuit 7. I assume it should be 12. Cleaned all the grounds I could find. Attached a long wire from batt negative to my multimeter and metered at all the grounds to see if there was a difference in potential. Less than .1v. The wiring is somewhat burned and rather hacked under a PO. Would love to both fix this issue and get the wiring closer to factory. Haynes manual seems a poor reference to understand the factory connections, wiring design, etc. Can you suggest how to proceed? Is there, for example, a picture/annotated diagram of what wires are attached to the fuse panel? Such a rats nest! |
GregAmy |
Nov 25 2019, 12:26 PM
Post
#2
|
Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
|
Retroracer |
Nov 25 2019, 12:55 PM
Post
#3
|
Senior Member Group: Members Posts: 616 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
I would recommend dealing with any hacked or obviously melted/burnt sections of wiring or loom before even starting to debug this. Best option is a replacement loom, but that is a high $$ option....
Over current faults in a wire that is part of a loom can lead to melted insulation and intermittent connections between that wire and others that happen to be in the same loom; also you can get high resistance points in the wiring too, leading to voltage drops on the loads. This sort of fault can present as all manner of weird voltages showing up, as disparate items try to current share, and also strange functional interactions - ask me how I know! Get the loom as near stock as you can, replace any and all suspect sections - then proceed to debug. My 2c. - Tony |
Lo-Fi Version | Time is now: 4th June 2024 - 09:30 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |