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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: LosT_HaVoc on May 07, 2015, 04:10:08 pm

Title: AC blower motor blowing fuse
Post by: LosT_HaVoc on May 07, 2015, 04:10:08 pm

Right now, I'm stuck in my college dorm, 300 miles away from my truck, but any ideas are helpful. I've replaced the fan speed switch and the resistor pack for the blower motor on my '87. Even after all that, it still blows the fuse when I turn on the fan. What could be wrong with it?

Title: Re: AC blower motor blowing fuse
Post by: bd on May 07, 2015, 04:21:50 pm

What happens if you simply unplug the power wire from the blower motor?  Does it still blow the fuse?

Title: Re: AC blower motor blowing fuse
Post by: LosT_HaVoc on May 07, 2015, 04:37:39 pm

Quote from: bd on May 07, 2015, 04:21:50 pm

What happens if you simply unplug the power wire from the blower motor?  Does it still blow the fuse?

Haven't tried that yet. But I'll try it. Thanks

Title: Re: AC blower motor blowing fuse
Post by: Irish_Alley on May 09, 2015, 07:47:30 am

can you even spin the motor by hand? voltage and amps to a motor depend on the resistance, so if a motor is hard to turn then the amps will rise or you have a short

Title: Re: AC blower motor blowing fuse
Post by: VileZambonie on May 09, 2015, 08:42:42 am

Quote from: LosT_HaVoc on May 07, 2015, 04:37:39 pm

Quote from: bd on May 07, 2015, 04:21:50 pm

What happens if you simply unplug the power wire from the blower motor?  Does it still blow the fuse?

Haven't tried that yet. But I'll try it. Thanks

This is where you should have started prior to replacing any parts. By disconnecting the load in the circuit you can easily determine if that component is causing the high current draw. Do this and bring a test light or meter to verify the integrity of the circuit.