Troubleshooting No Right Brake Light Signal on a Trailer with 4-Way Wiring Harness

Question

Question:

I am trying to trouble shoot a problem with my trailer wiring. it has the 4-pin hook-up. everything on it is working except for the right brake. the right light blinks for the turn signal but does not illuminate for breaks. the left light is working perfectly fine. the running lights/tail-lights are also functioning fine.any ideas?

asked by: john

0

Expert Reply:

It sounds like one of two situations. The first thing I would check, is the taillights connection to ground. Most taillights are grounded through their mounting hardware. Make sure that there is no paint or corrosion keeping the light from making a good ground connection. You should also check out the taillight bracket connection to the trailer frame. If the bracket is bolted to the trailer frame there may be rust and corrosion inhibiting the ground connection.

If a ground issue is not the problem, use a circuit tester, item # PTW2993 if needed, and check the trailer connector at the rear of the vehicle, without the trailer connected. If there is not a brake light signal in the connector where the green wire goes into the other side, then the problem is on the vehicle. There may be a blown fuse on the tow package circuit, or you may have a converter box installed on the vehicle. If there is no blown fuse and you have a converter installed, check the wires going into the converter with the circuit tester for the following functions.

Brake Signal on red wire, left turn signal on yellow wire, right turn signal on green wire and taillight signal on brown wire. The white wire should be connected to a suitable ground. You may also have a power wire that runs to the vehicle battery. This circuit should be fine since the other functions are working correctly.

If the wires going into the converter are not coming out correctly and the right brake signal not working on the trailer connector side, then there is a problem with the converter box, and it may need to be changed.

Finally, if the vehicle checks out, you will have to test the green wire from the trailer side connector, at short intervals all the way back to the right-side taillight. You should be able to find the problem in this manner.

expert reply by: Robert G

0

Answer 1

It sounds like you may have a loose wiring connection or a corrosion problem on the 7-way pin for the right turn/brake lights. This pin is the one at the 3-o-clock position as you're looking at the vehicle's 7-way; please refer to the linked…

view full answer...

Answer 2

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…

view full answer...

Answer 3

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…

view full answer...

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.

view full answer...

Answer 5

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

view full answer...

Answer 6

Yes, we do. To add a hitch to your 2024 Toyota Grand Highlander, I recommend the Curt Trailer Hitch item #C26VV. This hitch is custom fit and bolts to your Toyota with included hardware. This is a class III hitch with a 2" receiver. It has a…

view full answer...

Answer 7

Class I and Class II hitches both have a 1-1/4 inch receiver opening. The difference is that a Class I hitch has a lower tongue weight rating, usually 200 pounds and a lower towing rating, usually 2,000 pounds. A Class II hitch usually has a tongue…

view full answer...

Answer 8

I did some checking and the hub/drum we offer that will work for you is the part #8-430-5UC3. This uses the same bearings as the 8-415 and will be an exact fit aside from the fact this is a non-ABS setup and the 8-415 came in an ABS setup and non-ABS…

view full answer...

Answer 9

To add a hitch to your 2024 Toyota RAV4, I recommend the etrailer item #e23ZR. This hitch is custom fit and bolts to your Toyota with included hardware. This is a class III hitch with a 2" receiver. It has a 4,000 lbs towing capacity, and a 600…

view full answer...

Answer 10

To replace your NOK AD2527E seal you can use #168233. It has an inner diameter of 1.688 inches and an outer diameter of 2.332 inches. Based on what I could find on the NOK AD2527E the inner diameter is the same and the outer diameter is 2.328 inches.…

view full answer...

Answer 11

Yep, so long as your 2024 Subaru Crosstrek Wilderness is not a hybrid both the Curt and etrailer hitches will fit: - Curt Trailer Hitch Receiver #C13382 - etrailer Trailer Hitch Receiver #e98912 The only difference besides price is the finish; the…

view full answer...

Answer 12

As far as wiring for the 2024 Toyota Grand Highlander, we do have the Curt #C59236 available which is more of a universal hardwire harness. Unfortunately there are not any plug-and-play options that have been confirmed to fit as of yet (October 4,…

view full answer...