Join Date: Mar 2002
Location: Austin, TX, USA
Re: heater resistor
It's basically a speed reducer. High speed bypasses the resistor - either through the switch or via a relay. The lower speeds select one of the two resistors. The resistors get hot, and are located within the air duct to keep them cool. There shouldn't be any comonality with the wipers unless the power source is shared somehow. I don't have my schematics handy.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI