We are trying to pair a Furrion observation camera installed on our SportTrek Touring 302VRB. Tow vehicle is a 2018 GMC Sierra with Advanced Trailering Package. This package uses PWM to power the clearance lights and the camera. Result is low voltage to the camera rendering it useless.
Furrion tech support recommend a “lamp out” adapter be purchased from etrailer.com. This also did not work. Called them back and they state only solution was to rewire the “pre-installed” camera connection directly to the 12V battery.
We we are looking for suggestion/instructions how to do this ourselves.
You could always fish around behind the coach taillights to (maybe) find the feed that goes up to the clearance lights, then add a relay so they receive a true 12V from the battery up front. Of course this will require a wire being ran from the front battery.
The other question is would the power (PWM) from the tow vehicle actually be able to run the relay. I don't understand why GMC is using PWM power for clearance /tail lights, not everyone has LED lights on their trailer, so really, a good 12 load such as a couple of standard bulbs should cause the PWM circuit to deliver more current. Here is a simple sketch of the relay method, assuming the tow vehicle clearance /tail light circuit would activate the relay.
2018 Durango 318RLT Ford Lariat F250 Former RVIA master tech.