the power units also go bad every 40 years or so and cause erratic operation of the relays. It can be a subtle thing sometimes. If all other fixes fail, check how much voltage the power unit is putting out. 28 volts or so if I remember correctly. Its been a few years since I touched one of these. Relay cabinet of every one I have ever seen was a rat's nest horror of wiring for some reason. Maybe guys don't want to stay up in those hot attics a moment longer than necessary...
Last edited by trollog; 01/29/08 09:42 PM.