License plate and dash lights on with key on, but lheadlight switch in the off position |
|
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. |
|
License plate and dash lights on with key on, but lheadlight switch in the off position |
HalfMoon |
Jun 23 2014, 07:50 PM
Post
#1
|
Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
I started my car tonight and noticed despite the headlight switch being fully in the off position, my dash lights are on and my license plate light is .
Odd. Never saw that before. Headlight switch I imagine.... Thoughts? David Addedum-and saw what I thought was a wisp of smoke come from under my dash at the windshield....perhaps my imagination? |
Tom |
Jul 1 2014, 06:19 PM
Post
#2
|
Advanced Member Group: Members Posts: 2,139 Joined: 21-August 05 From: Port Orchard, WA 98367 Member No.: 4,626 Region Association: None |
David,
First of all, you need to separate all of the wires from each other. Then take ohm readings between each wire to ground. The one or ones with the "0" readings will be the bad ones. If someone previously cut and modified the wiring, it will be difficult for me to lead you thru what might be the problem as the wiring is no longer what the wiring diagrams show. However, I can lead you thru to find out why fuse #8 is showing "0" ohms. This will be done by making sure all of the wires from the load side of fuse #8 are separated and reading each to ground, then following that wire to where it is grounding and repair it. Don't despair because you don't understand electricity as well as others, I will walk you thru to the finish. From your observations, I would suggest that the wiper motor or circuit is to blame. A short explanation of DC circuits: The more resistance = less current and the fuse will not blow if within specs. The less resistance = more current and the fuse will probably blow. So if you have a reading of 2-3 ohms with a circuit that is protected by an 8 amp fuse, the fuse will not blow. Less than 1.5 ohms and the current will exceed 8 amps and the fuse will blow. Hope this helps, if not, PM me and I will try to explain it better. Tom |
HalfMoon |
Jul 1 2014, 07:19 PM
Post
#3
|
Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
David, First of all, you need to separate all of the wires from each other. Then take ohm readings between each wire to ground. The one or ones with the "0" readings will be the bad ones. If someone previously cut and modified the wiring, it will be difficult for me to lead you thru what might be the problem as the wiring is no longer what the wiring diagrams show. However, I can lead you thru to find out why fuse #8 is showing "0" ohms. This will be done by making sure all of the wires from the load side of fuse #8 are separated and reading each to ground, then following that wire to where it is grounding and repair it. Don't despair because you don't understand electricity as well as others, I will walk you thru to the finish. From your observations, I would suggest that the wiper motor or circuit is to blame. A short explanation of DC circuits: The more resistance = less current and the fuse will not blow if within specs. The less resistance = more current and the fuse will probably blow. So if you have a reading of 2-3 ohms with a circuit that is protected by an 8 amp fuse, the fuse will not blow. Less than 1.5 ohms and the current will exceed 8 amps and the fuse will blow. Hope this helps, if not, PM me and I will try to explain it better. Tom Extremely helpful Tom and informative. I am learning! I suspect I'll find something wrong with one of the red/black wires leading to 56 wiper. The wiper motor itself can be powered both high and low when hotwired (addedum-months ago when addressing another issue). We shall see tomorrow when I get further testing done. I'm very grateful for your help and judging by how many looked at this thread others are gaining valuable information as well D |
Lo-Fi Version | Time is now: 20th May 2024 - 12:09 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 ... |