Trailer Running Lights Not Functioning with a 2007 Dodge Ram Pickup

Question

Question:

I have a 2007 Dodge 2500 with the 5.9 diesel. I just purchased a trailer and discovered the running lights on the trailer weren’t functioning. The brake and turn signal lights were however functioning. Any guidance on troubleshooting, correcting this problem?

asked by: Andrew

0

Expert Reply:

There are a couple of things we can do to troubleshoot malfunctioning wiring on your 2007 Dodge Ram Pickup. I've linked to an article about troubleshooting your wiring issues below.

If the turn and brake lights are working but the running lights are not, then the first and easiest thing to do is to check your fuses. The 2007 Ram has an integrated power module that houses its fuses. It's right next to the battery. Check cavity number 15 (it's a 20 amp yellow fuse) for the trailer running lights. If that fuse is blown, you need to replace it.

If that is okay, then another easy thing to do is clean the vehicle and trailer grounding locations (typically a white wire). If there is any corrosion or paint getting in the way of the contact area, then there won't be sufficient power going through the system, which can cause malfunctioning. Be sure to check for a clean connection area (avoiding paint or rusted areas) for your ground. Move them to better spots if need be.

If that doesn't solve the problem, then the next thing to do is test the wiring harness with a circuit tester like the Hook Probe, part # PTW2993. I've linked to a video review of this tester that demonstrates how to do this. Depending on whether or not your Pickup has a factory-installed 7-way or an aftermarket 4-way pole, you'll need to determine which wire to test. Generally (though not always), a 4-pole has a brown wire for its running lights.

If everything checks out up to this point and the running lights are still not working, then the problem is with the trailer wiring. To find the exact point, you may need to trace the wires on the trailer side and look for any places where the ground wire is exposed and making contact with the trailer frame, which would "ground the wire out," causing it to malfunction. If you find any splits or frays on one of the wires, then you will need to replace that wire.

expert reply by: Kef G

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Answer 1

Your generation of Dodge Ram has a TIPM that controls the trailer wiring circuit fuses/relays. Your best option is going to be to run 10 gauge wire like part #10-1-1 (sold by foot) from the positive post of your battery through a breaker like part…

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Answer 2

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 3

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 4

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 5

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 6

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 7

The only difference between 7-Way Utility and 7-Way RV is the color of the wires. The pin outs are the exact same so either would work just fine with the other. If you check out the picture I attached you'll see that the functions are all the…

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Answer 8

Typically 4-way wiring consists of 18 and 16 gauge wires. For a 4-way that has all 16 gauge wire you would want the Wesbar 4-Pole Flat Connector #W787264. The part #HM38138 uses 18 gauge for all wires but the white that uses 16 gauge.

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Answer 9

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 10

Since you are needing a replacement lock as well as the key, you can use the Replacement Lock Core and Key #SR03807 for your Sears X-Cargo Sport 20 cargo box.

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Trailer Running Lights Not Functioning with a 2007 Dodge Ram Pickup

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