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Projects Early Ford heaters & volta - drop

Discussion in 'Traditional Hot Rods' started by Sweet & Low, Mar 17, 2018.

  1. Sweet & Low
    Joined: Feb 13, 2014
    Posts: 277

    Sweet & Low

    Hey guy's, I picked up a 1946 Ford and 2 speed 6 volt heater. My 46 has a 12 volt system, have any of you guy's used a 12 to 6 volta Drop successfully with a heater? I thought if I fed it with a fused dedicated 20 amp 12 volt circuit with a 6 volt runtz type volta drop would be OK. However I was just told I needed to use the new digital type volta drop type unit that comes with a small box to ease the load to the heater. What do you guy's think? Should I include a relay in this system? If so, should it be a 6 volt relay installed between the switch and heater?
  2. Just what voltage reducer are you thinking of using? Most of these are designed for relatively small loads, and even some of the larger ones won't like the current inrush from a motor. If it were me, I'd look for a 12V replacement motor rather than using the 6V one. Most of those fan motors are 'universal' type, there's a large selection of replacements with different case/shaft sizes available.
  3. paleot
    Joined: Aug 29, 2011
    Posts: 220

    from louisiana

    found a motor at Grainger that fit my 53 like factory. Less than 60 bucks.
  4. sdluck
    Joined: Sep 19, 2006
    Posts: 2,580


    We have been running a 6v motor on 12 v in my buddy's 1954 bel air for about 15 years.
    Elcohaulic likes this.

  5. Babar40
    Joined: Dec 4, 2009
    Posts: 313

    from Florida

    Napa sells the big porcelain reducer made especially for heater fans. Very specific and not for use on gauges.
    3340 likes this.
  6. sdluck
    Joined: Sep 19, 2006
    Posts: 2,580


    If you looking in Napa book you can probably find a 12 volt motor that has the same outside dimensions it's just swap the motor over

    Sent from my SM-G550T using The H.A.M.B. mobile app
  7. deathrowdave
    Joined: May 27, 2014
    Posts: 2,299

    from NKy

    12 volt motor is the answer . When you drop voltage by 1/2 you up the Amp load x2 . Voltage reducer will be hot enough to ignite flammables after 1 hour of operation . Just something to think about . I changed 48 F1 to later 12 motor very easily . Motors usually have a standard frame size to work with . Just my 2 cents

    Sent from my iPhone using The H.A.M.B. mobile app
  8. Sweet & Low
    Joined: Feb 13, 2014
    Posts: 277

    Sweet & Low

    Thanks Much Guy's. look like I need a 12 Volt replacement.
  9. Marty Strode
    Joined: Apr 28, 2011
    Posts: 5,321

    Marty Strode

    I used a replacement 12 v motor from RedDot. in my 53 truck.
  10. scrap metal 48
    Joined: Sep 6, 2009
    Posts: 6,073

    scrap metal 48

    I have used larger computer 12V cooling fans on old 6V heaters and works well and really cheap at surplus shops...
  11. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,344

    Rusty O'Toole

    Just take a center tap off the battery.
  12. As others have said, don't even attempt to use a reducer, swap out the motor. I nearly set my truck on fire trying to run a 6V blower motor through a voltage reducer, the reducer was attached to the bottom lip of the dash and got hot enough to blister the paint on the dash.
  13. Garpo
    Joined: Jul 16, 2016
    Posts: 205


    I used an ordinary ignition coil ballast resistor in the supply side. Worked fine.
    To check if resistor is near correct, measure voltage at motor connection while on high speed. Anything under 8volts should be fine.
  14. The 39 guy
    Joined: Nov 5, 2010
    Posts: 2,927

    The 39 guy

    I had trouble with my six volt motor in my auto therm heater. I was able to find a 12 volt motor on the NAPA web site. All I had to do was cut some of the length off of the fan shaft to make it work.

    scrap metal 48 likes this.

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