Troubleshooting No 12V Power At Pin on 7-Way Trailer Connector on 2004 Dodge Ram

Updated 05/12/2020 | Published 05/12/2019

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40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket

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Hook Probe Circuit Tester

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Question:

My constant 12v pin on the truck is not hot , how do I make it hit to power aux trailer lights

asked by: William H

Helpful Expert Reply:

The first step would be to check your fuses to see if anything has gone bad. Next, if your fuses are good I recommend checking your wiring connection directly behind your 7-way trailer connection. The 1 o'clock pin position in that connector should show power when using a circuit tester like # PTW2993. If it is not hot in that position, then make sure you turn your key to ACC and try again. If that still doesn't work, then you will want to run a new wire using # 10-1-1 and circuit breaker # 9510.

If you have power in the connector that isn't making it to the pin, then use # A10-7072VP as a replacement or if the harness further back shows function the connector and harness # PK11893-11933.

expert reply by: Jason S

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Harvey

5/10/2020

2005ram left directional light works on truck. 7 pin left directional doesn't. Where do i look ? Thanks in advance.

Chris R.

5/12/2020

There's a good chance a blown fuse under the hood is cutting off power to the left turn/stop circuit on the 7-Way. I wasn't able to pull up the owner's manual for your 2005 Ram, but if you look through your copy there will be a fuse/relay section that tells you exactly where this particular fuse is located. There might also be a relay for that circuit that you can check.