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I have a pair of LED lights wired on my truck to a 12V 4-pin relay all correctly with a switch. The system worked great every time until I decided I wanted to add a small 5mm LED, so when I turned them on I had an indication in the cab of the truck that my exterior lights were on.

I ran a ground for the LED and then wired the positive leg to the output side of the switch.

When I flip the switch "on", the small LED lights up like it should, but my exterior light no longer come on. That was the only thing I changed but it gets weirder.

If I take the small 5mm LED out of the equation and rewire it exactly how it was working before, it still doesnt work. I tried swapping in a new relay and still nothing. Any idea?

wiring diagram

CharlieRB
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user168694
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2 Answers2

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you wired your relay wrong. see pic.

relay diagram

dtm
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Finally figured it out, turns out the ground wire at the exterior light, under my rear bumper and tucked way up in the frame (thanks past me) had broken off when I hit a rock off-roading. Easy fix but hard to find. Thanks for all the suggestions

user168694
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