Troubleshooting a 7-Way that the Left Stop Turn Signal is Hot all the Time on 2004 GMC Sierra 3500

Question

Question:

why is my lh signal spade hot at all times truck running lights and brake work ok but constant power to 9:oo position looking into receptacle-using adaptor to 4 pin supplied with truck - when connected powers lh lamp so both signals flash -power should be in 1:00 position- can i pull a fuse in electrical centre to fix or do i have to rip plug apart or wrong adaptor? your reply would be very much appreciated-thanks,

asked by: Randy L

0

Expert Reply:

The problem has to be somewhere in the wiring. Was the 7-way recently replaced? It sounds like the 12 volt accessory circuit is either ran to the wrong terminal or is shorting out somehow to the 9:00 position of your trailer connector. Is there power constantly at the 1:00 position of the 7-way? This terminal is supposed to be the 12 volt power supply.

You might check to see if this circuit sees voltage when the brakes are applied or flashes when the left blinker is on. This would indicate that the two circuits have somehow been wired up backwards and would need to be swapped. The easiest way would be to cut the wires coming out of the back of the connector and use butt-end connectors to wire to the other circuit.

I attached an FAQ article on trailer wiring for you to check out also.

expert reply by: Jameson C

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Answer 1

The easiest way to find the reverse wire circuit is to use a circuit tester like part #PTW2993. If your back up light is a separate light at the rear of your Highlander, use the circuit tester to check the wire when the truck is in reverse. Have…

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Answer 2

It sounds like the fact your brakes are locking and releasing is what will cause the bounce and porpoising you are describing. It sounds to me like your surge brake actuator is sticking and then releasing and then doing so again and again as you slow…

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Answer 3

To find the reverse light circuit on a vehicle is pretty easy but it may take digging around in the door panels or interior panels of the vehicle. What you need to do is find the wires that lead into the reverse lights on your vehicle. Test both of…

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Answer 4

Since you have already tried replacing all the relays in the T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector #118273 on your 2016 Nissan Pathfinder, and you've replaced the running light fuse, it sound like you may…

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Answer 5

It sounds like you have a crossed wire after the fuse panel. Sometimes this happens inside the trailer connector, so I recommend removing your trailer connector and using a circuit tester like #PTW2993 to test each of the wire functions at the US Car…

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Answer 6

When power appears on a vehicle's trailer wiring when it should not the reason is usually a short or corrosion. The short-circuit or corrosion can let power from one circuit bleed over to another. Sometimes you can see the problem at the trailer…

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Answer 7

What you are describing is normally the result one 1 of 3 issues: First, there could be some corrosion in or on the connectors on the vehicle or trailer side or both. Second there could be a bad ground. Bad grounds can cause all sorts of bizarre…

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Answer 8

If both turn signals blinking at the same time is a new problem that has occurred after the harness had worked fine before, there are a couple of possibilities that may be causing the issue. First, the easiest thing to check are the trailer…

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Answer 9

I recommend testing the ground connections on the vehicle and the trailer. When you find that some of the lighting functions work, but not all of them, it is always best to check the ground connections. Check the ground on the connector on your…

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Answer 10

It sounds like you either have a blown fuse or a short on the right side turn light and brake light circuit. First, I recommend checking the trailer wire connector on the vehicle. You can use a circuit tester, like #PTW2993, to test that power is…

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Answer 11

If a 4-way trailer connector tester like part #I26 shows that the drivers side turn signal on the Curt T-Connector Vehicle Wiring Harness part #C56344 for your 2014 Jeep Compass is constantly hot then you would first want to remove the driver's…

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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 a 7-Way that the Left Stop Turn Signal is Hot all the Time on 2004 GMC Sierra 3500

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