1990 300ZX Z32 Fog lights not working

[Varick106]

The bulbs are good , replaced bad relay , the fuse is good . The dash fog light switch does not light. A quick check indicates no power to the dash switch. Could use some help troubleshooting. Thanks

[VStar650CL]

Okay, this is weird, the '90 EL section doesn't have a fog diagram. So I'm going by a '91 and figuring it's the same. First things first, do you have the low beams lit when checking the fogs? Nissan factory fogs have always been wired so they operate only with the low beams. Yours are no exception, the fog relay coil gets power from the righthand headlamp and ground from the fog switch. So if the headlights are off, the fogs are automatically off too.

If the headlights are on and the fogs are still out, first check for power on both sides of the fog fuse. Visuals won't tell you if a fuse has power, only that it isn't blown. If the fuse is good and has power, check for battery power at Green on the relay and power at Red/Green with the headlights lit. Post back results and we'll go from there.

[Varick106]

Is this the correct wiring diagram ?

[Varick106]

Doesn’t look to clear, can it be read , or should I try again ?

[Varick106]

I think this one is better

[Varick106]

VStar, disaster averted . You are the best. I was running the checks and then success. I’m guessing something was loose, not totally engaged.

Next up, the radio is not working. But I think a new one is in order. I don’t have any cassettes anyway .

[VStar650CL]

[VStar650CL]

BTW, for anyone who might need it, even though the fog WD is missing in the '90 FSM, it's identical in the '91 FSM. You can find it on EL-51, PDF page 1148.