What Can Be Used To Test Your Trailer Connectors For Functionality

Question

Question:

Can I use a test light to test my trailer plugs on a 2021 high country?

asked by: Ken

0

Expert Reply:

Hi Ken,

You can use a test light # PTW2993, multimeter # PT89ZR, 7-Way to RV Socket LED Circuit Tester # C73NR, 4-pole light tester # F4CT, or any other type of tester that can read DC voltage to test your 4-pole or 7-way socket.

expert reply by: Kevin C

0

7-Way Wiring Diagram
(click to enlarge)

Trailer wiring diagram
(click to enlarge)

Lazer S.

2/3/2026

Hey Ken, how did testing your trailer plug on the High Country go with the test light or one of the other testers? Knowing what worked might help others checking their trailer wiring too.

Answer 1

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 2

To install the Tekonsha Prodigy P3 #90195 on your 2002 Chevy Silverado K3500 you need the Wiring Adapter #3025-P which plugs in under your driver-side dash (see attached install video). If you already have the factory plug at the back then you're…

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Answer 3

The Prodigy P3 trailer brake controller uses a 4-wire hookup. The white wire is to be grounded to the battery negative terminal; the black power wire connects to the battery hot terminal through a circuit breaker; the red wire takes in the brake…

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Answer 4

No plug-in brake controller wiring is available for your 2008 Jeep Grand Cherokee, but luckily the P2 brake controller #90885 includes a pigtail that you can use to hard wire the unit to your vehicle. White: Ground, attached to the vehicle negative…

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Answer 5

The Pollak circuit tester #PK12741 will tell you which functions are working in a 7-Way trailer connector but it doesn't tell you the location of the functions within the connector. But I can tell you that. If you are looking at the face of a…

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Answer 6

There are a few things that can cause the brakes to lock up on a trailer. First, disconnect the trailer from the vehicle. Then use a circuit tester like #PTW2979 if needed to test the connector on the vehicle. Have someone sit in the truck and run…

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Answer 7

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…

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Answer 8

To test a 7-way trailer connector on the rear of your vehicle you can use the Pollak Tester #PK12741. This tester is designed to work with all 7-way connectors. Another option is to use a circuit tester like #PTW2993 and go come pin to pin testing…

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Answer 9

The P3 brake controller #90195 will only send back a little bit of power when just sitting so if you use the manual override on the controller then it should light up the tester solid. Using the brake pedal to test also will not work properly because…

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Answer 10

I haven't heard of the Curt 7-way tester not working with OEM brake controllers. There was a Tekonsha tester that had problems with Dodge and GM trucks so it is possible. We have been able to confirm that the Pollak 7-Way to RV Socket LED Circuit…

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Answer 11

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 12

I recommend using a heavy-duty vehicle wiring harness #119250KIT because it includes circuit protection to safeguard itself from electrical shorts. Vehicles using Pulse Width Modulation (PWM) will give your trailer lights full brightness during…

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What Can Be Used To Test Your Trailer Connectors For Functionality

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