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Could be, but more likely that t-one adapter went south. That is the most common reason for this.
The electrical adapter that converts the three way signal to two way signals on the tow car or vice versa dependin on whay you have.
No, it is the part that hooks up to the plug on your coach.
It is part of the coach wiring.
Yes........most all of them will have one. It takes just a few minnutes to test the one out you have. It might be just a loose wire. Hope that proves helpful here.
You are welcome! Please get back to me if you need more later. Be safe!