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Discussion Starter · #1 ·
I'm trying to figure out what is happening to my trailer lights. When I hook up a trailer I have both blinkers. When I press on the brake all the lights turn on. When I have the brake pressed and turn on a blinker all the lights blink. I have no running lights. I tried two trailers and both trailers don't work. I bought the truck a while ago and have had the light problem since I bought it. I checked the fuses under the hood and by the drivers door and can't find any blown.
 

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Check the grounds on the truck. There is a ground wire in your 7-way plug follow it and see if it is corroded. The pins themselves could be corroded too. Look for greenish buildup on the pins.
 
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