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EFV-8 Club Forum / General Mercury Discussion / 1947 Heater Motor

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Posted By Discussion Topic: 1947 Heater Motor

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lasmith03
01-22-2020 @ 5:37 PM
Member
Posts: 3
Joined: Jan 2020
          
I've read the other posts on this topic but didn't find and answer.

I have a 47 Merc Conv.

We are converting the car to 12V neg ground.

The heater motor in the car is a newer 2 wire 6v motor in the old 4 wire heater box.

The switch is the original 5 speed switch - off, heat fast and slow, def fast and slow.

Does anyone have a part number or source for a 12V 4 wire / dual speed motor that I can wire up to the original switch?

I don't really want to use a voltage reducer if I can help it because of the heat load.

Thanks,
Lance

alanwoodieman
01-22-2020 @ 6:48 PM
Senior
Posts: 864
Joined: Oct 2009
          
use a voltage resister but put it in the air stream for the heater, it jus helps add BTU's

TomO
01-23-2020 @ 9:39 AM
Senior
Posts: 7243
Joined: Oct 2009
          
Why are you converting the car to 12 volts? Unless you have a special need, it is better to leave the car at 6 Volts.

How much do you use the heater? Occasional use for short times (15min max) would probably limit the harm done enough for the motor to last a few years. Other than that, I would have the motor converted to 12 volts.

You could also rewire a 12 volt brush motor to use with your switch.

Tom

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