GoatRacer & John:
If one of you could verify that the both the wires on the wiper switch have battery voltage on them when the wipers are off and the key is on I think I've drawn a circuit that will work. It will require two small diodes, a Bosch style relay and an automatic reset circuit breaker (to mimic the one in your headlight switch). Probably less than $25 worth of parts.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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