Fuse? Relay? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 01-19-2009
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Fuse? Relay?

I recently installed a set of fog lights hooked up to the reverse lights on my truck . . they worked fine until it rained and somehow water got into the housing. I dont know if it was the water or maybe it was too much power, but now neither the fog lights of my reverse lights light up lol . . . i checked all the fuses (i think - the ones on the drivers side and the box under the hood) and still nothing, could i have burned all 4 bulbs? i did have a fuse from the t splice to the fog lights and that seems to be in tact as well. I tried to see if there was current running and it doesnt seem to have any. Brake lights and regular lights light up fine btw . . . its just the reverse lights. Im just going to wire the fog lights like normal fog lights with the switch inside the cab, but i dont know what to do with the reverse lights. . . do the relyas have anything to do with it??
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Old 01-20-2009
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Did you use a relay for your Aux reverse lights?
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Old 01-20-2009
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if I understand correctly... you connected the fog lights to the reverse lights directly?

I doubt the factory backup light fuse or wiring can handle the OEM backup bulbs as well as the load from an extra load of fog lights.

If you don't want to have a switch in the cab just for the fog lights, you'll need to run power from the battery to the fog lights (fused at the battery) and properly grounded, and a wire from one of the OEM backup lights to a relay to turn on the fog lights whenever the OEM backup lights come on.

The new lights really need their own power source (fused) and a ground.
Most likely, you've blown the fuse to the backup lights since all the other rear end lights still work.

If you go with a new switch in the cab, it would be advised to run a relay from the switch to power the lights. Many 12v switches can only handle 2 to 5 amps max & a set of fogs can draw much more than that.
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Old 01-20-2009
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ok so power from battery (w/fuse), relay from switch to fog lamps and fogs grounded. thats pretty much what i have set up now . . . after the fact. . . but if all the fuses are good now . . . then why do the reverse lights not work?
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