Troubleshooting Trailer Using 6-Way to 7-Way Adapter Where Brakes Are Always Locked Up

Question

Question:

I hooked up my trailer with a 6 pin round connector to my sons truck. He has a 7 pin flat to the 6 pin round with a brake controller and it locks Up the brakes what are we doing Wrong? Hi girl friend has a 2012 F150 without a brake controller same 7 pin flat adapter and no problems? Thanks

asked by: Brian

0

Expert Reply:

This is a fairly common issue when there is a 6-way trailer connector involved. The problem is that there is two ways that a 6-way will get wired and the only difference between the two is that the brake output and 12 volt accessory circuit are swapped. This causes the brakes to lock up whenever the towing setup doesn't use the same wiring setup for both the vehicle and trailer.

On the trailer you will want to cut the wires on the center pin and 2:00 pin and run them to the opposite wire and your problem will be fixed.

expert reply by: Jameson C

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Answer 1

The lights in the adapter will tell you that the vehicle itself is sending the proper signals for the directionals, running lights and brake lights. These lights are useful to eliminate the vehicle as being the cause of any wiring problems. It will…

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Answer 2

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Answer 3

The test lights on the 7 to 4-Way Adapter #47345 will illuminate when there is a signal showing that the circuits are working (on the vehicle side). The bottom one will light up when the running lights are working. The center light will illuminate…

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Answer 4

The reason your brakes are locking up when you use the 7 Pole to 6 Pole Adapter, #47549, is because there are two ways that 6-way round trailer connectors can be wired, as you may have already discovered. The difference is the pin for the electric…

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Answer 5

The problem that you are experiencing is likely happening because there are 2 different ways to wire a 6-Way trailer connector. The brake output pin will wither be the center pin or it will be in the 2 oclock position, if looking at the face of the…

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Answer 6

To install the controller itself, you will first need the #3025-P wiring harness. Under the hood, The red wire that provides power for the brake controller needs to be connected to the power post on the fuse box that is closest to the firewall. A 30…

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Answer 7

For your 2000 GMC Sierra 1500 there is not a connection to factory wiring for the connector you mentioned. My recommendation is to use the Vehicle Wiring Harness Kit with 4 Pole Trailer Connector (Includes Install Kit) #C59496 that is confirmed to…

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Answer 8

I attached a picture that shows how 6-ways are typically wired. Looking at your picture it doesn't look like the colors will match up and you will need to wire by function instead of by color. Most likely the missing circuit on your 6-way wiring…

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Answer 9

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Answer 10

7-Way connectors like the #A7WCB that you referenced should be wired by function and not color. Since trailer manufacturers can sometimes use non-standard color wires for the taillight functions of their trailer it is best just to determine the…

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Answer 11

To install the Prodigy P3 Trailer Brake Controller #90195 in your 2019 Nissan Pathfinder you can find the brake controller port directly under the dash as in the accompanying photo. This will allow you to plug in the Tekonsha Plug-In Wiring Adapter…

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Answer 12

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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Troubleshooting Trailer Using 6-Way to 7-Way Adapter Where Brakes Are Always Locked Up

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