Will a 7-Way Round to 6-Way Adapter Work with a Semi Tractor

Question:

Will this adapter conect from a 7 pole round semi tractor to a 6 pole round trailer connector and work all lights?

asked by: Richard M

Expert Reply:

A 7-way round pin on a semi tractor normally has different functions than a 7-Way round pole found on something like an RV. I have included a picture showing what the functions are on the 7-Way part of the adapter. If this matches what your semi tractor has then it will work properly.

If your 7-Way has different functions, which you can check by using a circuit tester such as # 3008, then you will need to re-wire the 7-Way to match the adapter or install a different 7-Way that will match.

expert reply by: Michael H