2010 Silverado 1500 LT-No voltage at trailer connection.

[Sirrascal63]

I am not getting any voltage readings at the rear of my truck where the trailer wires are. I have detached the trailer plug and tested each wire with a volt meter. The brown wire is showing short to ground (white wire). All fuses seem to be okay. Thanks for any help!

Edited April 8, 2022 by Sirrascal63

[richard wysong]

I believe there's a fuse for trailer lights in the under hood fuse box. does that have power? just tail lights or brake/ directional too? you might want to check the connector behind the bumper

[Sirrascal63]

Previous owner looks like they did some splicing and the 7-way doesn't seem to be wired correctly. The fuses check good. I have disconnected the actual 7-way plug. I just purchased this truck.

The brown wire at the back bumper is showing short to ground. White wire is showing as ground as it should. Would anyone have an idea of where the brown wire connects to get the signal for the tail lights?

Edited April 9, 2022 by Sirrascal63

[dna9656]

You are just going to have to trace it out. Usually there is a splice (in factory jobs) in the wiring at the bumper, you might disconnect the pig tail (the wire bundle after/at) the splice then check what the factory did, odds are good the trouble is not in the factory harness but down stream. You can hunt it down with a VOM using continuity tests to see if the brown wire (rt turn signal) is shorted to the white wire. Tracing it out is all about isolating each extension of the harness, this is why you have to start at the end and work your way to the fuse or breaker if necessary. 

[swathdiver]

You can get the wiring diagram with a subscription to AllDataDIY.

[Sirrascal63]

38 minutes ago, swathdiver said:

You can get the wiring diagram with a subscription to AllDataDIY.

Thanks!

[Sirrascal63]

20 hours ago, dna9656 said:

You are just going to have to trace it out. Usually there is a splice (in factory jobs) in the wiring at the bumper, you might disconnect the pig tail (the wire bundle after/at) the splice then check what the factory did, odds are good the trouble is not in the factory harness but down stream. You can hunt it down with a VOM using continuity tests to see if the brown wire (rt turn signal) is shorted to the white wire. Tracing it out is all about isolating each extension of the harness, this is why you have to start at the end and work your way to the fuse or breaker if necessary. 

Thanks!

[Sirrascal63]

On 4/8/2022 at 7:59 PM, richard wysong said:

I believe there's a fuse for trailer lights in the under hood fuse box. does that have power? just tail lights or brake/ directional too? you might want to check the connector behind the bumper

Fuses good. Previous owner may have done some wiring hacks.

[swathdiver]

So is it fixed now?

[Sirrascal63]

On 4/30/2022 at 12:12 AM, swathdiver said:

So is it fixed now?

No. I have not had time to trace the wires back.

 

[richard wysong]

you say the fuse is good but  does it have power at the fuse?

[Sirrascal63]

On 5/2/2022 at 6:23 PM, richard wysong said:

you say the fuse is good but  does it have power at the fuse?

I will let you know.