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BUSY BOLTERS Are you one?  The Shop Area
continues to pull in the most views on the Stovebolt. In August alone there were over 22,000 views in those 13 forums.
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Jul 21st, 2025 | | | | Joined: Jun 2005 Posts: 980 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 980 | I'm working on getting my heater working in the '55 Grumman. It's never been connected since I've owned the truck, and the tag on the heater box says "6V", so I've been reluctant to diagnose it. I was pleasantly surprised yesterday when I tore it down to see the motor (2.3 amp) was a fairly new 12V, and the heater core was nearly new.
Now to wire it. I have a period type heater switch that I would like to use. It has the light in the switch that comes on when power flows through it. The only markings on it I can locate are "ARK-L". It has two spades in the back; one for motor and the other for power, with a resister.
So, can I use this for my 12V heater? How can I tell if it is a 6V switch, or does it matter?
Thanks for your help.
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | | | | Joined: Sep 2013 Posts: 1,288 'Bolter | | 'Bolter Joined: Sep 2013 Posts: 1,288 | The switch doesn't care if it's 6 or 12 volt. The indicator light however does. If it's a 6 volt light, it likely won't last long on 12 volts (but it may). One test would be to hook it up to 6 volts and see if it lights up sufficiently to see in daylight, if so it's likely a 6v light .
1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The only variation between the 6 volt & 12 volt switch will be the resister. I would try it & watch the resister to see if it gets too hot. The original Grumman had a 2 speed motor. If it has a ground plus 2 more wires, it probably is a 2 speed motor. You would not need a resister. I have used ign. resisters for heater motors.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jun 2005 Posts: 980 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 980 | Thanks guys. I was going to try to find an LED 12v bulb to put in it. You know what happens to those kind of switches over time.....the heat from the bulb melts the plastic knob. The fan motor only has two wires: power and ground. The switch is three position: off, low, and hi. I don't know if the switch will control the speed of the fan motor or not. Probably doesn't matter anyway, as long as it supplies current to the motor. If I need heat, I can't imagine I will want to be turning it on "low" because it gets so hot in there  I'll hook it up and see what happens. Thanks again.
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | | | | Joined: Aug 2003 Posts: 106 Shop Shark | | Shop Shark Joined: Aug 2003 Posts: 106 | These guys are a great source fo r electrical components. I use them a lot. Saves money too. Del City
"I always win." Working mainly alone I do not let my trucks win a war. Maybe a battle here and there but never the war.
Robert
55.1 GMC 450 COE
51ish GMC Suburban
| | | | | Joined: Jun 2005 Posts: 980 'Bolter | | 'Bolter Joined: Jun 2005 Posts: 980 | Thanks Robert. I've seen Del City be recommend. The last time it was for quality wire at a good price. I think I've got them bookmarked.
~ Victor 1941 3/4-Ton Pickup (in process). Read about it in the DITY Gallery1955 Grumman Kurbside "Doughboy" 235/3 on tree w/ OD 1957 3100 - moved on 1959 C4500 Short Bus "Magic Bus" - moved on 1959 G3800 1 Ton Dually "Chief" - moved on 1958 C4400 Viking "Thor" ~ moved on to fellow Bolter | | |
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