Availability of 7-Way Tester for Trailer Wiring
Updated 11/13/2025 | Published 11/10/2025
Question:
A 7 flat pin trailer plug tester from the trailer. I have a tester that checks the tow vehicle receptacle. Is there anything out there?
asked by: Wayles H
0
Expert Reply:
Hey Wayles, we do have the type of tester you are looking for with the Hopkins # HM50928. I know it's probably more expensive than you anticipated but to test the functions on the trailer it requires current be applied to each circuit that is normally created by the tow vehicle so it's a bit more involved than testing the vehicle 7-way. Is your trailer wiring giving you problems?
expert reply by:
Jameson C
0
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Wayles H.
11/11/2025
Thanks for your speedy reply. There was a problem with the trailer 7 way plug. I changed the plug on the trailer cord and the tow vehicle's receptacle. I would in turn start the tow vehicle, turn on the headlights and 4 way flashers. I would then walk around the trailer to check the lights. All seemed OK. Now with everything OK, I would drive my vehicle then turn on the trailer haul button. After a few yards or miles the tow vehicle's info screen would beep, saying "Check your trailer connection". The trailer lights would still be working. I then turned off the trailer haul button and the beeping stopped. No more warning signs. I later took the trailer plug apart and attached ring terminals on the 6 wires and put the plug back together. That is why I want to check the trailer wiring. I even looked for the wiring diagram to make sure everything was in the right spot. Later, I checked the vehicle's sensor block under the dashboard to check for any problems. It came back saying my hood was open and a window was down. I checked the fuses, all OK. I am just stumped on this problem. I do not want to go to my dealer and pay $$$ to get it fixed.