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Old 10-18-2017, 06:03 PM
grens404 grens404 is offline
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Default 97 - Fuse #3 blows when trailer harness is in

I'm having a very odd issue with my #3 fuse (inside vehicle). Whenever I plug in my trailer lights and I turn on my headlights my #3 fuses always blows - dash lights, cluster lights, and tail lights.

Has anyone had this issue before?

Last edited by grens404; 10-18-2017 at 06:35 PM.
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Old 10-18-2017, 11:34 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: 97 - Fuse #3 blows when trailer harness is in

Something is shorting to ground, most likely on the trailer side since you dont seem to have an issue with it NOT plugged in. So assuming you're not using a brake controller or a 7 way, wiring should be as follows.



The brown wire is your culprit as it is all your running lights and what is likely shorting to ground in your cluster or #3 fuse if you will. Best thing to do is unplug the trailer and use a DVOM (digital Volt meter) or an AVOM (analog volt meter) and check the brown wire and anywhere on the frame of the trailer for continuity test. Which if the meter beeps or buzzes [whatever] then its showing a defined connection much like that of testing both ends of a single light bulb.



You will have to either follow the harness and look for a pinched wire or a part of the wire touching the trailer body/frame somewhere.

.
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Old 10-19-2017, 04:34 AM
grens404 grens404 is offline
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Default Re: 97 - Fuse #3 blows when trailer harness is in

Thank you for the picture. I'll give that a go and see what happens. I'll report back with a conclusion
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Old 10-19-2017, 09:59 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: 97 - Fuse #3 blows when trailer harness is in

Let us know
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Old 10-24-2017, 04:56 PM
grens404 grens404 is offline
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Default Re: 97 - Fuse #3 blows when trailer harness is in

Sorry for the late response. I was able to locate the problem. I have a 4-round male adapted coming off of the trucks harness. I have a 4-round female plug on my trailer that I use. I bypassed this and hooked up my trailer directly to the truck's harness. Fixed the issue.

Using my volt meter I was able to find out that the 4-round male adapter on the truck is wired incorrectly which is casing the short.
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Old 10-25-2017, 06:40 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: 97 - Fuse #3 blows when trailer harness is in

Awesome sauce..

Pat yourself on the back for a job well done for me. Glad to hear that issue is resolved for you.
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