Fog Light Problem

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?

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)

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?

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?

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.

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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)