Best Way To Test Trailer Side 7-Way Without A 7-Way On Tow Vehicle

Updated 05/28/2024 | Published 05/23/2024

Products Featured in This Question

Dexter Electric Trailer Brake Assembly - 12" - Right Hand - 6,000 lbs

(196)

$82.00

Tekonsha Trailer Wiring Circuit Tester

(16)

$454.27

Question:

Hello, I have a 1974 apache pop up trailer and I am currently trying to retrofit the original trailer plug harness from the rectangular 6 way plug it came with to a modern 7 way plug. I have all my wiring connected per the diagrams that I have but Im not sure how to test if everything is working as it should. My tow vehicle does not have a tow hitch or wiring installed yet, thats next on the list but I wanted to make sure my trailer wiring was 100 done before moving on. The tools I have for testing are a multimeter, test lights, 12v jumper pack, and various wire connectors. I tried testing for continuity and I get continuity between the 12v accessory and ground, and I get continuity between the turn signal/brake pins but Im not sure how to apply power and see the lights turn on. Thanks for any advice!

asked by: Dylan

Expert Reply:

Hello Dylan. Without having a vehicle to connect to, the only way to properly test your trailers 7-way is to use a tester like the Tekonsha # 8010 or the Hopkins Tow Doctor # HM50928. These testers provide a power source and will allow you to test all of the functions easily by yourself. These testers are expensive though, so if it were me. I would go ahead and put that money towards installing a 7-way on the vehicle so you can test it that way. If you can let me know the year, make and model of your vehicle I can recommend a 7-way kit for you.

Aside from that, another good way to test this is to just find a friend or neighbor with a truck and 7-way and just plug in real quick to test the trailer. There is really no good way to test the trailer with the supplies you listed.

expert reply by: Jesse M

Dylan

5/28/2024

Tha ks for the reply, I've actually already installed a hitch and plug on my tow vehicle since I asked this. I think I'm about 90% complete but I'm having some issues with the 12v circuit on the trailer. I have some suspicions about some of the wiring from the previous owner. Thank you though!