Originally Posted by john4170
Our local Volvo dealer wasn't much help this afternoon, other than determining that the Swedes who installed the hitch receiver and 4/7-pin wiring didn't do something right. They tested all the pins, to find that there was no (4) Black 12-volt battery power and nothing on the (2) Blue Brake Controller Output. The other pins tested fine. Any ideas?
Did they test it with the ignition on? Many vehicles will only power the black battery power circuit while the ignition is on, so you don't run down the vehicle's battery while dry camping in the trailer.
The brake thing should work, though, unless you have no brake controller. I'm guessing you don't - it should have a setting somewhere that would allow you to adjust the sensitivity (voltage), since every trailer is different. You probably need to add a Prodigy or something.