[qcj]

The tick might be from the relays above your head that switch the speakers from the tv to the car stereo when ignition is on.

OK Forest, but it sounds like it is coming from the dash and I could be mistaken and will pay closer attention.  It will keep ticking as long as the ignition is on, like when I raise the coach with the 120 volt compressor.  After I start the engine I don't hear it.  Too many other noises. If it is a speaker relay should it keep ticking? It has always done this and the other day Mary ask why.