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08-19-2003, 06:54 PM | #1 |
Scooby Specialist
Member#: 33293
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: Central Jersey
Vehicle:2011 4-door STi Plasma Blue |
Headlights go on...oil pressure guage goes crazy
The needles just pins past 100 psi. It only happens when I turn on the headlight switch. The only thing I can think of is that I tapped the ground for the oul pressure gauge with the same ground that used to be for the light in the stock guage. This way i can contol the brightness. It works perfectly fine with the lights off. I always thought a ground is a ground no matter what but not the case here. can anyone suggest why this is happening?
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08-20-2003, 01:58 AM | #2 |
Scooby Specialist
Member#: 15409
Join Date: Feb 2002
Location: Lakewood, CO
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A ground is not always a ground, especially in a negative dimmer wire. The negative voltage varies with the dimmer. However, a chassis ground is always a chassis ground, and you can't go wrong with that.
josh |
08-21-2003, 02:11 PM | #3 |
Scooby Specialist
Member#: 33293
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: Central Jersey
Vehicle:2011 4-door STi Plasma Blue |
Yeah the dimmer ground must be messing with the guage. I completly overlooked that. I always thought that the dimmer was controlled by the amount of voltage sent through the power wire. Oh well can you tell me a good spot to get a chasis grounding point somewhere near the front of the car. Maybe I can just pull it from the radio ground.???
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08-21-2003, 04:37 PM | #4 | |
Scooby Specialist
Member#: 5887
Join Date: Apr 2001
Chapter/Region:
BAIC
Location: Fremont, CA USA
Vehicle:2002 GDAA (bugeye) 797 (blaze yellow) |
As stated, the "ground" for the stock gauge actually varies with the dimmer switch.
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08-21-2003, 04:52 PM | #5 |
Scooby Specialist
Member#: 15409
Join Date: Feb 2002
Location: Lakewood, CO
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I wouldn't recommend using the radio ground because you'll increase your chance of inducing noise into your system. There is plenty of metal behind the radio and under the dash.
josh |
08-22-2003, 10:52 AM | #6 |
Scooby Specialist
Member#: 33293
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: Central Jersey
Vehicle:2011 4-door STi Plasma Blue |
Anyone that have a good suggestion for a chassis ground. Maybe someone else who has the center mount defi style pod can tell me where they grounded there guages.
Thanks, Danny |
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