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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: Apr 2010 Posts: 27 New Guy | | New Guy Joined: Apr 2010 Posts: 27 | I put a new harness in my '49 and now want install my heater switch and wire it to the heater motor (6V). I need to know wire guage to use and the correct terminal from which to get the power for the heater. The switch terminals are marked B and M. I assume M means it's the motor terminal. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
The installation manual says to get power from the dead terminal on the ignition switch (dead when the ignition key/switch is in the Off position).
If you have the original heater-motor switch. Facing the front of the switch, the power-in goes on the left terminal and the power-to-motor goes on the right terminal (the terminal closer to the heater when the switch is mounted under the dash).
| | | | | Joined: Apr 2010 Posts: 27 New Guy | | New Guy Joined: Apr 2010 Posts: 27 | Thanks. What about wire guage and fuse size? | | | | | Joined: Sep 2009 Posts: 433 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 433 | SPL this Link should help ...
1954 Chevy 3104 3 Window Hydra-Matic in my family for over 60 Years
Once in a while you get shown the light in the strangest of places if you look at it right... "Scarlet Begonias" Grateful Dead 1974
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