No Running Light Power on Truck Side 4-Way Trailer Connector

Question

Question:

NOT GETTING ANY POWER TO MY TRAILER RUNNING LIGHT PRONG COMING OFF MY TRUCK BUT I ,HAVE POWER TO BRAKE AND TURN SIGNALS LEFT AND RIGHT PRONGS 4 PRONG ADAPTER COMING OFF TRUCK

asked by: AL H

0

Expert Reply:

If there is no power on the truck side trailer connector running light circuit then it could be a blown tow package fuse or a loose connection, damaged wire, or ground issue. If the connector on the truck is factory then consult the owner's manual to locate the fuse related to the tow package running light circuit.

You can also check the vehicle side connector for corrosion inside, where the wires attach, and outside on the pins. Inspect the wiring as best as you can from the connector forward on the truck and repair any damaged, pinched, or loose wires.

If you are using an adapter such as # 37385 then there could be a problem inside the adapter. So if the truck's connector has power but the output side of the adapter does not then the adapter is the problem. If you can open up your adapter you may be able to repair the problem. Otherwise you would need a new adapter.

expert reply by: Michael H

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Answer 1

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 2

It sounds like you are having an issue with the running lights on your trailer. If that is the case then since you have tested the trailer connector and found that power is not reaching this, you either have a blown fuse, bad converter, or shorted…

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Answer 3

I am a little confused as to were the connector is, on the truck or on the trailer. Brown wires are typically associated with running lights. If there are 2 wires coming out of that pin and we are talking about the trailer side then you have what…

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Answer 4

Did you have a 4-pin connector that had 5 wires or was it a 5-pin connector? There is a big difference since you normally see a 5-pin connector on a boat trailer with the 5th pin used for an electric reverse lockout solenoid on a brake actuating…

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Answer 5

You have a wishbone harness like #A20WB. This type of wiring harness splits the running light circuit at the trailer connector, so you don't have to run a jumper wire from taillight to taillight. The yellow/brown wire is the running light circuit…

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Answer 6

Your 4-pin/5-wire wiring harness is what is called a "wishbone" type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which…

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Answer 7

Connecting the brown running light wire in standard 4-pole wiring to both tail lights will require a jumper wire from one side of the trailer to the other, or you can install what's called a wishbone harness that has dual brown running light…

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Answer 8

To determine why you do not have any power on the blue brake output wire, I recommend starting at your brake controller. First, make sure the brake controller is on and receiving power. Most brake controllers have 4 wires, blue (brake output to…

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Answer 9

If you are only getting 1.5 volts at your brakes then there is an issue, but there is not a fuse that controls the brakes. There are a number of possible issues so you will need to find out if the issue is on the brake controller, truck, or trailer.…

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Answer 10

Something is obviously causing a voltage drop between the brake controller and the trailer connector. The usual culprit in this type of situation is a break in the wire or a corroded wire. Check the wiring under the truck. You should be able to trace…

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Answer 11

This could certainly be a grounding issue. When a circuit does not have a sufficient ground, it can cause many different issues. If possible, I recommend checking all of the grounds for your trailer taillights. You will want to make sure the ground…

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Answer 12

There are many things that can affect the voltage on the brake output wire from your brake controller to your trailer brakes such as the power setting on your brake controller, how you are testing the wire and if you are testing it with the brakes or…

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No Running Light Power on Truck Side 4-Way Trailer Connector

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