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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2008 Posts: 73 Shop Shark | | Shop Shark Joined: Nov 2008 Posts: 73 | I bought a 12 volt heater switch from chevs of the 40's and wired it. It's a 3 position switch and the heater runs fine. However I was under the dash and it looks like the rheostat is glowing hot. I know I'm reducing voltage to 6 volts for the heater but not sure this is how it should work. Don't need a fire at this stage! | | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | The amprage goes UP as the voltage goes DOWN...so using a 12 volt switch on a 6 volt motor is a bad thing. Your new switch may be rated at 15 amps and your 6v motor may be pulling 20 amps or more which would be a fire hazard. Mike B  | | | | | Joined: Nov 2008 Posts: 73 Shop Shark | | Shop Shark Joined: Nov 2008 Posts: 73 | So should I get a 6 volt switch our keep the 12 volt and put a resistor in between the switch and heater? | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | If you are running a 6 volt battery & 6 volt heater you need a 6 volt heater switch. The switches with built in rheostat & resisters will get but not glow like that.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
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