Click on image for the lowdown. 
====
| | |
8 members (klhansen, Shade Baby, Shaffer's1950, JW51, Cosmo, Oswald, 2 invisible),
57
guests, and
4
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,075 Posts1,055,919 Members48,429 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | I asked this question over in the Electrical Forum and never got a clear answer so I'm trying here.
Is there any way you can tell the difference between a 6v and 12v heater motor? The one I have wasn't hooked up but it does have plastic/rubber coated wires, not cloth. When I hold the wires to a 12v battery for a few seconds it runs and doesn't start smoking or anything.
I'm electronically illiterate and needing some help on this before I commit to installing my heater.
Last edited by Czechman; 02/14/2009 10:46 PM.
| | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Woody,
IIRC, I asked this same question to my friend that owns a motor repair shop. Again, IIRC, the resistance value of the windings, measured with an ohmmeter would be about the only way to tell, and I have no clue what they would be.
Having said that, my thought would be to 'listen' to the speed of the motor. I think a 6 volt motor connected to 12 volts will sound 'too fast' even to the untrained ear. If you hook your motor up to 12 volts and it sounds reasonable, I'll bet it's a 12 volt motor.
Your observation about wire insulation could be right on the money. A true vintage motor would probably have the brown cloth covering whereas a more modern 12 volt motor might have true plastic insulation, but this again is just a guess.
Stuart | | | | | Joined: Jan 2009 Posts: 1,644 Shop Shark | | Shop Shark Joined: Jan 2009 Posts: 1,644 | HI, yes a 6 volt motor that is hooked up to 12 volts would run at 2x its normal speed , the only way to really find out if its 6 volt or 12 volt is to take a ohm reading the only problem is You have to have one that You know is 6 or 12 if You want I just took out My 6 volt heater motor today I can OHM test it tommorow and give You the reading , Pete PS. You got a OHM meter ? | | | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | Hi Pete,
Man, I would be very appreciative if you could do that for me. Yes, I have access to an OHM meter... a friend will test mine. It's embarrassing but I don't know an OHM from a volt. | | | | | Joined: Jan 2009 Posts: 20 New Guy | | New Guy Joined: Jan 2009 Posts: 20 | Woody, I had the same problem on my 55 1st series, If the motor runs at really high speed it is a 6 volt, I cured my problem by ordering a part # EL135 H.D.voltage reducer from Jim Carter. Problem solved.
steve
" Hard Times Don't Last , Strong People Do."
| | | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | Steve, That's good to know but first I have to find out if mine is 6v or 12v. | | | | | Joined: Jan 2009 Posts: 1,644 Shop Shark | | Shop Shark Joined: Jan 2009 Posts: 1,644 | Hi,its 37.3 OHMs that is on a 6 volt that I took out of the truck on sat. Pete | | | | | Joined: Sep 2007 Posts: 2,644 Shop Shark | | Shop Shark Joined: Sep 2007 Posts: 2,644 | Thanks Pete for the info and the PM. | | |
|
|
