The subject amplifiers pre-amp function has quit working. Neither RF sensing or

front panel manual swithch will activate pre-amplifier. Called TE systems and

Dave said they don't have schematics for that model, their Engineers jus t

know how to build and repair them. This would never pass ISO 9000 documented

process requirements.

Guess next step is to remove amplifier from truck and see if I can get the covers

off and find the relay activation circuit parts.

May try to bring it to breakfast Saturday.

Mel KC0P/R