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IB853347201's avatar
IB853347201
Nomad II
Apr 12, 2026
Solved

Towing lights issue

Have a 2010 Suncruiser 37j on a Workhorse W22 gas chassis. Power to the 7 pin trailer towing plug receptacle has quit. Anyone know where the fuses are to this? Have checked the main fuse block panel ...
  • IB853347201's avatar
    IB853347201
    Apr 15, 2026

    Well I followed all the suggestions and thoughts shared by everyone on this post and Voila! Issue resolved. Turns out that the issue was caused by severely corroded terminals in the 7 pin receptacle. I used a multimeter and found that the pins were live although tricky to connect to. After using some contact cleaner and a fuse cleaning file, everything works like new. 

    Again, thank you all for your help with my issue. 

bid_time's avatar
bid_time
Nomad III
Apr 12, 2026

One other item that I should note. The 7 pin connector doesn’t have separate fuses for the towing lights. For instance, if the right turn signal on the vehicle works, the right turn signal post in the 7 pin connector should also work - they are protected by the same fuse. Same with all the other “towing” lights. This may not necessarily be true for all vehicles, but to the best of my knowledge this is generally true; exceptions could exist especially if this is an after market 7 pin setup.

Grit_dog's avatar
Grit_dog
Trailblazer
Apr 13, 2026

Good point. I’m sure a 15 year old RV mostly likely has the trailer lights just piggybacked to the chassis lights. Probably at the back somewhere just spliced into the tail lights on the chassis. 

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