A brake controller like the Prodigy P3 # 90195 interacts with only one lighting circuit on a vehicle, the circuit for the brake light switch, which is typically above the brake pedal. This brake signal triggers the controller output for the trailer.
Turn signal lights on the car are not required to connect to the controller in any way so if this light function is affecting the operation of the controller then it is possible that there is a short in the 7-way socket or the wiring leading... view full answer...
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