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

Thank you for purchasing the LED Combination Tail Light Kit for Trailers under 80" Wide #TLL9RK! To troubleshoot a certain light function on your trailer you definitely want to start off by checking your connections and grounds which is sounds…

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Answer 2

Hey Jason, there are no fire concerns with the Tekonsha wiring harness part #118784 that you referenced. The issue that the Hyundai harness had is totally different than this harness so while I totally get your concern it wouldn't be anything…

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Answer 3

From the research I did the easiest way to determine if you have a tow package would be to check to see if your 2009 Hyundai Santa Fe has a transmission cooler mounted in front of the radiator. A transmission cooler looks basically like a miniature…

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Answer 4

A tow package for your 2007 Hyundai Santa Fe could be a frame mounted trailer hitch and trailer wiring harness. If you have either or both of those two things you could pretty easily assume you have the tow package. Another option you have is to take…

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Answer 5

We can resolve this issue. This seems like a 12-volt continuity to the lights, or a grounding issue at the lights themselves. Since you are having trouble with two different wires, but not all lights, I would double check your 12-volts to the right…

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Answer 6

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 7

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 8

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 9

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 10

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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What Can Be Used To Test Your Trailer Connectors For Functionality

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