North American Turbocoupe Organization



Fog Light Problem
88BirdOfPrey Offline
Member
#1
Took out my foglights for inspection because ever since I got the car, they were non-operational. There was a messed up connector on both sides, so I fixed those. One bulb doesn't work. Both don't light. I checked the voltage and only get half a volt, which does not seem right at all. What could be the reason for this and what must I do to get these precious fog lights to work?
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Jeff K Offline
Administrator
#2
Does the light on the fog light switch light up? If so, the fuse (#7) is good. First thing to do is check for 12V at the Tan/Orange wire at the back of the fog light switch. Use a 12V test light to do this, not a voltmeter! If you have power there, use the test light to check for power across the 2 terminal connectors at each fog light.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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88BirdOfPrey Offline
Member
#3
Quote:Originally posted by Jeff K:
Does the light on the fog light switch light up?

Well, first thing, I can't tell right now and I won't be near my car until later. Should it be bright enough to see in the day time, or is that light naturally dim?
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88BirdOfPrey Offline
Member
#4
Quote:Originally posted by Jeff K:
Use a 12V test light to do this, not a voltmeter!


What's the reason to not use a voltmeter?
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Jeff K Offline
Administrator
#5
The indicator light on the fog light switch is fairly dim, and hard to see in daylight.

A voltmeter is a very high input resistance device, and will read 12V even if there is high resistance in the circuit. (A voltmeter draws almost no current from the circuit under test) A test light actually draws current (around 100 to 500 milliamps), and wil not light up if there is more than a few ohms resistance in the circuit.

------------------
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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