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Re: Dash air/heat Blower Not Working - Blowing Fuses [message #371292 is a reply to message #371291]

Sun, 23 April 2023 19:35

RF_Burns

Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada

Karma:

Senior Member

According to my 1975 chassis wiring diagram, the 25 amp fuse runs the blower in all speeds but HI. In High, it only has to power the High-Speed relay coil and there is a separate 30 Amp fuse from the alternator to the high speed relay to run the blower on high speed.

I'm guessing there is a fault in the high speed relay coil circuit or the high speed wire to the coil has gotten shorted to ground The high speed relay coil should only take a couple hundred milliamps.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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[Message index]

		Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Sun, 23 April 2023 14:26
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: RF_Burns on Sun, 23 April 2023 19:35
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Sun, 23 April 2023 23:37
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: RF_Burns on Mon, 24 April 2023 07:04
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: JohnL455 on Mon, 24 April 2023 08:23
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Mon, 24 April 2023 21:28
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: JohnL455 on Wed, 26 April 2023 11:49
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: RF_Burns on Thu, 27 April 2023 08:37
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Wed, 10 May 2023 20:06
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Wed, 10 May 2023 20:11
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Fri, 12 May 2023 19:32
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: JohnL455 on Sat, 13 May 2023 08:30
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Sat, 13 May 2023 14:22
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Tue, 16 May 2023 21:10
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: JohnL455 on Thu, 18 May 2023 16:32
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Thu, 18 May 2023 23:56
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: JohnL455 on Fri, 19 May 2023 09:03
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Fri, 19 May 2023 22:14
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Sat, 20 May 2023 18:59
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Ken Burton on Sun, 21 May 2023 00:53
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Sun, 21 May 2023 15:11
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Sun, 21 May 2023 15:15
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Tue, 23 May 2023 15:55
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: JohnL455 on Wed, 24 May 2023 14:07
		Re: Dash air/heat Blower Not Working - Blowing Fuses By: Carl S. on Wed, 24 May 2023 20:41

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