7-Way RV Trailer Connector Wiring Diagram

Question:

trailer connector wireing diagram. need to know which color wire go to which post.

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Expert Reply:

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it.

If you are looking at the inside of the trailer connector where the wires mount to the terminals starting at the notch at the top and working clockwise:

1:00 is Black and 12 volt power
3:00 is Green and Right Turn and Brake
5:00 is Blue and Brake Controller
7:00 is White and Ground
9:00 is Yellow and Left Turn and Brake
11:00 is Brown and Tail and Running Lights
Center is Purple and is Optional Reverse

I recommend using a circuit tester like part # 40376 to verify your connections.

I attached a picture to that shows how the connector should be wired.

Click to Enlarge
Click to Enlarge
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Follow up Questions

Richard

When I put the turn signal on it flashes all the lights on the trailer also there is no running lights and we have but dont seem like the Brakes on the trailer wont Engage

72307
Reply from Chris R.

It sounds like you've got a few issues going on. I'd start by testing the 7-Way (or 4-Way if that's what you have) on the tow vehicle with a circuit tester. Make sure you're getting power at all the appropriate pins with the corresponding function activated (turn signals, brake lights, etc). This will tell you where the issue actually is - the vehicle or the trailer. From there inspect your wiring to make sure all the connections are correct and look for any frayed or exposed portions that need to be replaced. Look at the connector itself (both on vehicle and trailer) for any debris or corrosion that needs to be cleaned out. With regards to the actual brake function on the trailer - are you using a brake controller in the vehicle? Let me know what you find and we'll go from there. 59261

Janine M.

Trailor brakes are locking up. hook up is right. please help. 1990 Fleetwood prowler lynx

70568
Reply from Chris R.

I would start by testing the brake output pin on your tow vehicle's 7-Way (5 o'clock position) with a circuit tester. See if you only get power there with the manual override activated on the brake controller. If you're getting power at any other time then there's a short somewhere between the controller and 7-Way. You would just need to inspect any wiring you can along the vehicle to check for any exposed, pinched, or otherwise damaged portions that need to be fixed. If the 7-Way tested normal then something is going on with the wiring on the trailer side. Inspect the trailer's 7-Way itself for any corrosion that needs to be cleaned out and then inspect the wiring leading back to the brake assemblies. Let me know what you find and we can go from there. 57587

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