 Weird Electrical Happenings-Part 1, ...turning headlight knob effects full gauge |
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| 7TPorsh |
 Aug 20 2010, 09:13 AM
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#1
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7T Porsh  Group: Members Posts: 2,691 Joined: 27-March 06 From: Glendale Ca Member No.: 5,782 Region Association: Southern California 
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I have a bunch of little weird electrical things going on...so i'll attack one at a time:
The fuel gauge (stock combo gauge) moves as follows under different conditions: - Ignition off/headlights on- turning headlight knob up makes fuel gauge go from empty to full; turning down go back to empty. - Ignition on/headlights on- fuel gauge show reading...turning knob up increases the reading on the fuel gauge by 1/4 tank; turning down decreases...so 1/4 fluctuation in the fuel gauge depending on how the headlight knob is turned. Tend to think the full bright on the headlights translates to a closer fuel reading. But why? is the power source for the fuel gauge incorrect? I checked the schematic, but it looks like a Lucas engineer designed the wiring for the combo gauge. |
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| Mike Bellis |
Aug 27 2010, 01:07 PM
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#2
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Resident Electrician Group: Members Posts: 8,347 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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There is a dash light that illuminates with the parking lamps. White/Blue or White Green, I think. Make sure your dash lamps are connected correctly. If the alt light goes on with parking lamps and off with head lamps, I think the bulb is connected wrong.
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| 7TPorsh |
Aug 27 2010, 02:00 PM
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#3
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7T Porsh Group: Members Posts: 2,691 Joined: 27-March 06 From: Glendale Ca Member No.: 5,782 Region Association: Southern California
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QUOTE(kg6dxn @ Aug 27 2010, 12:07 PM)  There is a dash light that illuminates with the parking lamps. White/Blue or White Green, I think. Make sure your dash lamps are connected correctly. If the alt light goes on with parking lamps and off with head lamps, I think the bulb is connected wrong. hmmm...ignition off and parking lights on; which bulb/light should light up? it's very possible the bulb wires are mixed up... |
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| Mike Bellis |
Aug 27 2010, 02:44 PM
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#4
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Resident Electrician Group: Members Posts: 8,347 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
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QUOTE(7TPorsh @ Aug 27 2010, 01:00 PM) QUOTE(kg6dxn @ Aug 27 2010, 12:07 PM) There is a dash light that illuminates with the parking lamps. White/Blue or White Green, I think. Make sure your dash lamps are connected correctly. If the alt light goes on with parking lamps and off with head lamps, I think the bulb is connected wrong. hmmm...ignition off and parking lights on; which bulb/light should light up? it's very possible the bulb wires are mixed up... If I remember correctly, there is a lamp at the 7 o'clock position in the tach or speedo for the parking lamps. I may be wrong with the location, I run Autometer gauges now. Take the 6 screws from the gauge cluster and pop it out. you should see the wire I mention somewhere. |
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Posts in this topic
7TPorsh Weird Electrical Happenings-Part 1 Aug 20 2010, 09:13 AM
Cap'n Krusty Check your grounds, then use the wiring diagram to... Aug 20 2010, 09:29 AM realred914
I have a bunch of little weird electrical things ... Aug 20 2010, 10:36 AM Tom Did this just start after you made some repairs/mo... Aug 20 2010, 11:33 AM 7TPorsh I think it has always done this and I just discove... Aug 20 2010, 11:37 AM Tom Since it has been sitting for a while, I would exp... Aug 20 2010, 12:05 PM kg6dxn Electrical systems will do strange things when a g... Aug 20 2010, 01:07 PM Tom Mike,
Very well put. Exactly what I was thinki... Aug 20 2010, 01:11 PM 7TPorsh Where are the ground connections points? Diagram s... Aug 20 2010, 01:49 PM
kg6dxn
Where are the ground connections points? Diagram ... Aug 20 2010, 02:58 PM 7TPorsh Well i checked around...behind the front trunk pul... Aug 27 2010, 12:06 PM realred914
Well i checked around...behind the front trunk pu... Aug 27 2010, 12:42 PM realred914
There is a dash light that illuminates with the ... Aug 27 2010, 02:53 PM |
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