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An update to a topic from back in November:
Turns out the "heavy duty" voltage reducer from Chevy Duty is only 1 ohm,
and rated for 50 watts. The heater motor in my truck is about 2 or 2.1
ohm, which, if you do the math, puts about 95 watts through the voltage
reducer. Mine burnt out after about two months of winter use.
I suppose I can call my local electronics store and have them special
order a 2 ohm, 50 watt power resistor so I don't burn out another
resistor.
(For those of you unfamiliar with the math, in order to cut the voltage
supplied to any load - like the heater motor - in half, you have to
install a resistor in series with the load that has the same resistance as
the load. The wattage rating for the resistor needs to be the voltage
squared, divided by the resistance -- P = V^2 / R -- for my heater motor,
the power dissipated by the resistor would be 6^2 / 2 = 18 watts, so a
50W-rated resistor would be just dandy.)
On Wed, 15 Nov 2000, New Mexico Jim wrote:
> Do you have an ohm meter? can you measure the resistance in that
> resistor? thx
>
> tim wrote:
> > On Mon, 13 Nov 2000, Jim Nordwall wrote:
> >
> > > Help, its getting cold in Illinois. My 50 has been converted to 12 volt
>and
> > > has an original heater. I think the blower motor is also original. It
>will
> > > run on 12 volts, but it seems like it is running too fast. Can anyone
>tell
> > > me how to check it to find out if it is a 6 volt motor. What size resistor
> > > (ohms and watts) can I put in series with it to keep from destroying it. I
> > > am taking the safe way and assuming it is a 6 volt until proven otherwise.
> > > Thanks for your help.
> >
> > I installed the "heavy duty" voltage reducer from Chevy Duty in-line
> > between the heater switch and the motor after getting my 6V motor rebuilt.
> > A multimeter reading shows that the motor is now getting about 4.5V, which
> > is just dandy.
> >
> > Tim Lloyd, omaha@tmbg.org
Tim Lloyd, omaha@tmbg.org
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