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| | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | I NEED YOUR THOUGHTS AND SUGGESTIONS. I’ve got a stock 1958 Chevy 3100 with all original equipment , I’ve got an original deluxe heater and original deluxe heater control switch. The wire to ignition switch to the heater switch has an old school inline 20 amp fuse . Every time heater fan motor is switched on, the fuse blows in one minute. Do I have a short circuit, or a fam motor pulling to much power or something else. Where should I start in tracking down the problem and what all and how should I problem solve the issue. Thanks for any advise. Pete
Last edited by Gdads51; 10/28/2025 11:22 PM. Reason: add detail to title
| | | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | Sorry stock 1958 283 engine original switch and heater etc | | | | | Joined: Oct 2021 Posts: 6,965 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,965 | Bypass the switch and see if the fuse blows. If not, buy a new switch.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Dec 2020 Posts: 1,979 'Bolter | | 'Bolter Joined: Dec 2020 Posts: 1,979 | could be a bad motor. bad wiring. you could add a fuse block.
~ BD.
"You won't find me in an old folks home" Pioneer Florida Cracker
1958 Apache Stepside
1958 Apache 1/2 ton Panel
1959 Apache 1/2 ton Panel
| | | | | Joined: Aug 2010 Posts: 608 'Bolter | | 'Bolter Joined: Aug 2010 Posts: 608 | Maybe the motor has dry bushings and it has to work too hard, drawing too much current and blowing the fuse. Also, does it have multiple speeds? If so, the blower motor resistor could be an issue.
1965 C60 school bus | 1967 GMC 6500 school bus
| | | | | Joined: Jan 2022 Posts: 2,502 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,502 | You didn't state:
a. if the fan was turning or not
b. if the fuse blows when the fan is only at low speed
c. if the fuse blows at low and medium speed
d. if the fuse only blows at high speed
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | The fuse blows when the switch is turned on and the fan runs but the fan only blows at one speed kinda low compared to my other 58 truck and doesn’t increase speed as I increase the fan control on switch to a higher speed. The fuse blows after on 30-60 seconds later. Maybe not even that long. Thanku for any suggestions. Pete | | | | | Joined: Sep 2009 Posts: 6,044 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 6,044 | Pete - Since this all involves primarily electrical components, I've move the thread over to the Electrical Bay for further conversation. 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | Where is the motor resistor. Is it replaceable or in motor housing or windage of motor. I’m not experienced in electric motor parts n functions. Thankyou for any suggestions | | | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | Thankyou. Been awhile since I’ve posted. Glad everyone here is still sharing knowledge. Pete | | | | | Joined: Jan 2022 Posts: 2,502 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,502 | The stock 58 deluxe heater fan resistors are directly behind the fan switch .
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Jan 2022 Posts: 2,502 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,502 | So the fuse blows even if you leave the fan switch in low?
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Nov 2005 Posts: 206 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 206 | Thank you. I’m thinking LMC may have these. I hope | | |
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