Blower Motor problem 1980 bronco
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Freshman User
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From: Lake Havasu City
Blower Motor problem 1980 bronco
Alright guys, I just added a 1980 Bronco XLT to my personal fleet and need some help. This truck was stripped down( doors, tailgate, carpet, a/c etc) and used as a desert truck. I'm in the process of returning it to daily driving duties and am having a problem getting the blower motor to work. With the switch on I get power to the hot lead of blower ONLY IF I disconnect the ground lead from the blower. I can disconnect both leads and jump straight to battery and it spins just fine. Kinda stumped here. Probably something simple that I'm hoping one of you may be able to help with. I know, it's sounds like a basket case but it's a good solid runner and yes, the doors and tailgate have been reinstalled 
1980 Bronco XLT 351M
1980 Bronco XLT 351M
Fleet Mechanic
Joined: Sep 2003
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Places to look for the problem are switch contacts (dirty, corroded, or fried), then connectors, etc.
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Freshman User
Joined: Apr 2014
Posts: 36
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From: Lake Havasu City
The first thing I think of, is the power wiring has a high-resistance connection in it. With the ground side of the motor disconnected, you read 12 volts through the resistance because you are only drawing microamps (or less) of current with a DVM, so no real voltage drop across the resistance. Different story with the load of the motor! Try a 12 volt bulb instead of the motor, as the bulb draws current, and see.
Places to look for the problem are switch contacts (dirty, corroded, or fried), then connectors, etc.
Places to look for the problem are switch contacts (dirty, corroded, or fried), then connectors, etc.
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