Originally Posted by firstname.lastname@example.org
I have not. What is the test for this?
I don't know for sure, someone else can probably chime in. I'd imagine it involves verifying the solenoid is receiving voltage. If it gets power and is not locking out reverse, I'd replace the solenoid. You said you have power to the female portion at your truck, now you need to verify voltage at the solenoid to be sure it's making it all the way there.
What kind of trailer is it?
You may be able to hear the solenoid click by having someone shift the truck into reverse while you listen at the tongue of the trailer.