Just received a reply from Robart. The Aux Battery port requires a three wire battery plug to function. Well...that answers that! However, I still need to know how to cut the signal wire so the Aux battery doesn't affect the receiver. Anybody know how that is done?

Chris, many thanks for your input. Can you give me a short cut to the important threads discussing the retract block fix? Amazing I haven't heard about this before now.

Thanks,
Keith