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EFV-8 Club Forum / General Ford Discussion / 12v to 6v reducer for heater

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Discussion Topic: 12v to 6v reducer for heater

budlite28

02-18-2022 @ 10:28 AM

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I am converting my 39 coupe to 12v. I am replacing the gauges with NVO gauges (12v) but I need a reducer to 6v for the heater motor. I don't think the reducer for gauges will carry the load of the motor. Any ideas?

37RAGTOPMAN

02-18-2022 @ 11:43 AM

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I would try CERTIFIED AUTO ELECTRIC in OHIO
you also need senders for the fuel gauge and temp gauge,
6vto12v@gmail.com their speciality
but why 12 volts ?

There must be a problem elsewhere,
make sure you install a NEW WIRING HARNESS. [ or have a good one, ]
you do not want any faulty wiring , that can short out, with 12 volts
37Ragtopman ,Maine

budlite28

02-18-2022 @ 1:00 PM

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I'm doing an engine swap, 383 stoker thus the 12v system. I got all new senders. Just want to keep the heater going

supereal

02-18-2022 @ 1:08 PM

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C&G shows a 12volt heater motor, but at $185, you might go for their 6 amp power converter at$105.Most voltage reducers are designed for use on gauges and will not carry the current draw for anything other than gauges, C&G does show a 6amp dropper for radios as B-10606, 6 amps. You can reach them at their tech line 760-871-0445 for more.

TomO

02-19-2022 @ 7:58 AM

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You are better off trying to find a 12 volt motor that will fit or replacing your heater with a truck heater from 1957 or later.
The 6 volt motor will run on 12 volts, but may not last long due to deterioration of the bushings and insulation.

Tom

juergen

02-19-2022 @ 8:25 AM

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You need an adjustable wire wound resistor rated at about 100 watts on the safe side. Your 6 volt heater draws less than 20 amps and in slow speed probably about 5 amps. At 20 amps it would dissipate 120 watts which is what your 12 volt source would need to dissipate to get to 6 volts at the same current rating. The resistance at 20 amps is 6/20 or around 1/4 ohm while at 5 amps it would be around 1 ohm. Set it for 1 ohm and decrease the resistance till you measure 6 volts at its output as your 12 volt source powers your 6 volt heater at max speed.

I searched ebay and found lots of suppliers. I used this to reduce the voltage to my 34 Ford horns which also draw a lot of current.

budlite28

02-19-2022 @ 1:04 PM

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what about something like this? uxcell Power Voltage Converter DC12V/24V to DC6V 20A 120W Waterproof Voltage Convert Transformer

carcrazy

02-19-2022 @ 3:18 PM

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The best bet from a functionality and reliability aspect might be to have your motor rewired for a 12V negative ground system by a competent motor repair shop. Be prepared to spend some money as this might prove to be the most expensive of the alternatives.

juergen

02-20-2022 @ 8:29 AM

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The uxcell convertor certainly has the right specs and needs no adjustment.

37RAGTOPMAN

02-20-2022 @ 2:54 PM

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most new cars have a resister pack in them, for heat and air cond to have multi speeds,
they go from 12 volts and down ,
it would be possible to have a voltage reduction to the 6 volt blower motor
it might require a little testing, to see if it is possible
hope this helps,
37 Ragtopman,

This message was edited by 37RAGTOPMAN on 2-22-22 @ 2:16 PM

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