Reply With QuoteCheck your vehicle's fuses. Newer vehicles have seperate fuses for trailer light circuits.
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Trailer lights
Have checked all the wiring, made sure the ground is good. Checked the harness--good. Problem. Everything works just fine until I put the brakes on then everything goes off. ?????? Any ideas?
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Check your vehicle's fuses. Newer vehicles have seperate fuses for trailer light circuits.
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Bill H. PTC USN Ret
Chesapeake, Va
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I think it's probably a ground problem still, assuming there isn't a wiring issue. Verify your fuses like Bill said, but if that doesn't help, get a set of jumper cables and clamp one end of one cable under the truck someplace on bare metal and then attach the other end of that cable to bare metal on your trailer. Make sure you are bare metal to bare metal. If everything works like that, it's a ground issue.
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My money is on Barnacle Bill. Don't know about Fords and Dodges, but GMs have a power box under the hood with circuits for the trailer system.
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Charlie Weaver USN/ENC 1965-1979
Slabmaster
yep I had this same problem in my chevy and it was a fuse that was causing the issue. Almost drove me crazy trying to figure it out!Originally Posted by jigflinger
T
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Yep~~~~GMC. Thought about the fuse but need to do both the jumper cable as well as check the fuses. Thanks for the information. If I figure it out I'll let ya know.
You can't finish what you don't start
Slabmaster II
seen that happen before on a friends trailer, turned out to be a bad ground- no problems since...
SHERMAN
Crappie Wall Hanger
I agree with Sherman, if lights,(running) work fine then when you hit the brakes and everything quits it is a ground problem.......now a trailer tounge that bolts into the frame , or a swing away tounge are two of the biggest things I run into, if your ground wire is attached at the coupler and the tounge tube is bolted to the front of the trailer then you could be loosing the ground there, I would work on cleaning the ground for the trailer, and for all the lights behind each one. A blown or missing fuse under the hood on the newer tow trucks will cause wierd things like 1 brake light or one side of the running lights to not work, but if lights are working then add more power to the system (brake lights) and the ground is weak it will shut off every thing
Tom
"The reason I play Golf.....there are no broke down boats on a Golf Course"
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Betcha it's blown fuses under the hood.
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