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Hookmaster

Trailer Running Light Fuse Keeps Blowing

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Hookmaster

My truck is a 2015 Silverado. The trailer running light fuse keeps blowing after about 10 minutes of the trailer lights being on. This has happened with 2 boat trailers, one 19 years old and one 1 1/2 years old. I have tried 4 trailer adapters with the same results. It looks like something with the truck wiring. I am looking for where to start troubleshooting or is there a harness that I can replace?

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Jim Almquist

Take a look under your truck and follow the trailer wires and you should see where it ties in with 2 plugs. Sounds like you might need a new trailer harness or at least see if any of the wires in the harness are damaged. Sorta sounds like your brown wire is shorting to ground which would be your running lights.

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Bigfatbert

A short is definitely the issue .  Check running light bulbs , one of them is corroded into its socket thus shorting out , thus the blown fuse .

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BobT
19 hours ago, Jim Almquist said:

Take a look under your truck and follow the trailer wires and you should see where it ties in with 2 plugs. Sounds like you might need a new trailer harness or at least see if any of the wires in the harness are damaged. Sorta sounds like your brown wire is shorting to ground which would be your running lights.

Ditto this. Chances are the wire is rubbed down somewhere and shorting out to the trailer metal. It works for a while because vibration is keeping the wire away but eventually it happens to touch and this blows the fuse. 

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Fishouttawater

If no luck on the trailer. Follow your wires on your truck frame. Usually driver side. See if there’s a spot where the wire has to jut out around a body piece and check there as well. Check for broken or bare wires. Good luck

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Hookmaster

I checked out the truck wiring and it looked good. I towed my duck boat last weekend and the running lights worked. So, it must be my fishing boat trailer. I'll check light bulbs first but may need to rewire since it's seen 20 summers.

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leech~~

Sounds like a worn wire grounding out some where.  One of my trailers I just pulled the whole wire harness off and put on a new one. Not fun but it worked. 

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