Blower motor no high speed?

Tiny
RICHARD ROARK
  • MEMBER
  • 1997 CHEVROLET 1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 20,000 MILES
Blower motor blows 50-amp maxi fuse when put on high speed even with the blower motor disconnected. Replaced relay and blower resistor and checked the blower motor with jumper to battery.
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Tuesday, August 1st, 2023 AT 6:33 PM

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Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,615 POSTS
Hi,

Does the fuse fail if you remove the relay? Power from the 50-amp fuse goes to the relay, but it isn't used until the relay primary circuit is completed. So, if it fails with the relay removed, the short is in the wire between the relay and the fuse.

I attached the wiring schematic below.

Let me know.

Joe

See pics below. Note: I had to cut the schematic in half to make it readable for you. I did overlap the two so you can follow from one to the next.
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Tuesday, August 1st, 2023 AT 10:35 PM

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