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(ET) Chattering relays



My service book comments on lack of drive control,   first, check
voltage at relay terminals (36 vdc) , second will be control card #1 may
be defective,  it's an excellent idea to clean the contacts on the board
to plug ins.  If you need a schematic of the board, I could send you a
copy but probably by snailmail as I have no scanner.

wombat