No Brake Signal on a 7-Way Round Pole Trailer Connector on an RV r

Updated 05/23/2012 | Published 05/21/2012

Products Featured in This Question

Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End

(154)

$12.09

Roadmaster Brite-Lite 3-to-2 Tail Light Converter for Towed Vehicles

(128)

$56.90

Question:

No brake voltage on left/right turn signals and apparently its supposed to be there for my SMI/stay and play four down towing system to work properly. Any idea why the volage isnt there, yet the RVs lights work fine.

asked by: Bob

Expert Reply:

If your RV came with a 7-Way round pole trailer connector then it could be that there are fuses or relays that need to be in place or replaced if present to make the 7-Way fully functional. Check the owners manual to determine the location of any fuses or relays related to the trailer connector.

If you hardwired in the trailer connector and the RV has separate turn and brake lights then the brake circuit will not be present with the turn signals on the 7-Way. You would need to covert the separate signals into a combined circuit between the tail lights and the 7-Way using converter # RM-732.

A 7-Way round vehicle side connector should be wired like in the picture I have provided. I know of the SMI system but I am not all that familiar with how it works. I did look at a diagram and it would appear that it assumes the turn signal and brake circuits are already combined.

expert reply by: Michael H