So just to recap so i understand, so your getting voltage at the connector that is being plugged into the receiver, and also said receiver worked when plugged into a different car?

The only things i can think of past that would be to plug the receiver into the car where it worked and make note of where the red and black wires are to double check its getting plugged in correctly, if it's still not working I'd suspect a faulty servo that grounded it's self internally causing the receiver to shut down