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#89468 10/14/2002 5:04 AM | Joined: Feb 2000 Posts: 15 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2000 Posts: 15 | I recently located an original Rubber Fan Defroster at the local swap meet for my 46 Truck. This was installed on either the dash board or steering column (Heaters and defrosters were options) Looks like it could be pluged into the cigar lighter. Question: It's got a 6 volt motor, and my truck is 12 volt. Can a reducer be attached somewhere? :confused:
Don't pee on my leg then tell me it's raining!
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#89469 10/14/2002 3:45 PM | Joined: Sep 2002 Posts: 62 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2002 Posts: 62 | Theoretically, yes. I've never tried this, but the way it was explained to me was . . .
You'll need to start by using a 6v power source. Try to get your hands on an old 6v battery. Hook the fan up with an ampmeter and measure the current drawn by the fan. Divide 6 by the reading you get on the meter to determine the resistor you will need. For example if the meter read .5 amps, you would need a 12 ohm resistor (6 / .5 = 12). Be sure the resistor is able to handle all of the current that the motor will draw. Then all you have to do is put this resistor in the power line going to the motor. | | |
#89470 10/14/2002 5:49 PM | Joined: Apr 2002 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2002 Posts: 146 | An easier way to figure this out. Your just doubling the voltage. So you need to double the resistance of the circuit. Measure the resistance of the motor with an ohm meter. Thats how much resistance you need to ad to go from 6 volts to 12 volts. Mine was 2 ohm. The wattage of the resistor is very important. That motor uses around one hundred watts. So you will need a resistor that big and it will still get very hot. My frist try the resistor got so hot the solder melted. So be careful where you mount it.
if it dosen't need fixed, break it
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#89471 10/14/2002 10:56 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Kedso, running and stationary resistance of a motor are two differant things. The motor generates a back emf when it is running raising the resistance. If you just measure dc resistance your resistor will be too small.
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