Troubleshooting Trailer Lights Not Working

Question

Question:

Lights won’t work when hook up RV to 3500 dodge. I was only having trouble with electric brakes not working till a guy mess with it Now I’ve got nothing when I hook RV up to truck. I’ve checked fusses under hood their good 2007 dodge 3500

asked by: Bruce V

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Expert Reply:

While I'm not privy to what a guy did that may have caused the issue you're having, I can give you some troubleshooting steps to try, though you certainly did the right thing by checking your fuses. Next, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring.

If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they are correct then your issue is likely going to be with the trailer side wiring. You will also want to check both your vehicle and trailer connectors for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you are going to need to either replace the plug or clean the corrosion. You'll also need to make sure your grounds are attached to bare metal surfaces and free of any paint, dirt or corrosion.

I have added links to a pair of help articles on trailer wiring, including a troubleshooting guide which I highly recommend taking a look at.

expert reply by: Kyle S

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Answer 1

When it comes to installing The Redarc Tow-Pro Liberty #RED52VR if there is no trailer connected, the active calibration may occur as normal without any indication from the LED., provided your brake light trigger point is active when there is no…

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Answer 2

I would be happy to help! First, we need to see exactly where the signal of the trailer brakes is getting lost. Using a circuit tester like #PTW2993 check the 5 o'clock pin on your 7-way connector while the vehicle is on and while a buddy…

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Answer 3

If the 7-way you are referring to is the trailer side connector you will only need the blue wire in the 7-way if your trailer has electric trailer brakes. I do know that there are several trailers on the road with 7-way connectors for the charge line…

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Answer 4

You can mount trailer axles above or below the leaf springs. The difference is just the amount of ground clearance that the trailer would end up having. The biggest advantage with the spring below the axle (trailer will be lower) is that you would…

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Answer 5

The only sort of protection we offer for wire leads such as those on the 25 Ft 5-Way Trailer Wiring Harness part #A25W5B would be wire loom, the 3/8" Diameter Wire Loom part #39035. This can be used to cover the length of wire on the tongue or…

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Answer 6

Normally this is corrosion or dirt on the pins of the trailer connectors that only requires some sanding to get rid of and fix. If you already checked for that it could also be a bent pin on the connectors as well. The "no connection" light…

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Answer 7

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 8

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 9

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 10

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 11

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 12

Hey Jeremy, Typically with boat trailers the manufacturer will install hydraulic surge brakes because you don't have to worry about the water damaging wires like you would with electric brakes. That being said, if you use a heat shrink butt…

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