Trailer light problem...
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Freshman User
Joined: Nov 2004
Posts: 30
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Trailer light problem...
I have a 02' F-350 and the marker lights on the trailer won't come on everything else works fine. The fuse is ok and the wire coming out of the fuse block has power on the trailer marker light ciruit but when you get under the truck there is no power at the plug behind the transfer case. So I'm thinking there must be a relay or something that I can't find. I checked all the fuses and relays just to be safe and I can't come up with anything. Thank You
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Joined: Jan 2001
Posts: 57,025
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From: Virginia
In the fuse box under the the dash, you should have fuse #36, 20 amp. This feeds power to the trailer parking lamp relay. This relay is also located in the fuse box under the dash. The brown wire from the truck's parking lamp system, triggers the trailer parking lamp relay coil, which hooks a brown/white wire running to the rear to the 20 amp fuse.
You also have a trailer back-up lamp relay, which also uses the same 20 amp #36 fuse. It runs to the rear on a black/lightgreen wire.
You also have a trailer back-up lamp relay, which also uses the same 20 amp #36 fuse. It runs to the rear on a black/lightgreen wire.
