Question about Cars & Trucks
By operating the relay should click even if window doesnt work you could listen for it and try to locate that way
Posted on Apr 21, 2013
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Posted on Jan 02, 2017
On a 1977 F-250 there is no such thing as a blower motor relay. There are basically 3 things in that system the switch in dash, the blower motor and the blower motor resistor. It seems to me the blower motor is fairly easy to get to in those years. Do you have a test light? Check to see if you have power to the motor I think it's an orange wire. No test, light take a length of insulated wire and hook one to the terminal, on the blower motor, where the orange wire would go now, touch the other end to + battery terminal, the blower motor should run. If not the motor is junk or you have a bad ground on the motor. It could very well be the blower motor resistor too, that is usually fairly close to blower motor, it's bolted to the duct work with two small bolts. They tend to get hot and the wire terminals get rusty and the connection fails, you may want to check the resistor first. Good luck.
Posted on Jan 04, 2010
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