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| | | | Joined: Mar 2011 Posts: 1,146 Shop Shark | | Shop Shark Joined: Mar 2011 Posts: 1,146 | Can you run 12 volts DC thru a 6 volt DC, 2 or 3 speed resistor switch? Picture of 2 & 3 speed switches resistor on back of switch. When the HIGH position is selected resistor is not in the circuit. When the MEDIUM or LOW positions are selected resistor is in the circuit. 3 Speed Switch Photo Album 3 speed switch taps the resistor twice for 2 different resistances. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | yes you can, but the result will depend on if the motor you're running is 12V or 6 .... if a 6V fan motor it would be safer to have a runtz resistor before the switch to drop the voltage, if a 12V motor, the fuse on the switch should be sized according to the rated motor draw
Bill | | | | | Joined: Mar 2011 Posts: 1,146 Shop Shark | | Shop Shark Joined: Mar 2011 Posts: 1,146 | Ok, If I hear you correctly you're saying, if I'm using a 6V fan motor it would be safer to put a
runtz resistor before the switch, which drops the voltage from 12v to 6v.
Why can't I send 12v thru the switch to the 6v fan motor?
What will happen to the fan motor and the switch?
I have a 6 volts starter motor that I send 12v to.
It spins like crazy and works fine. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | 6V things take higher current than 12V, which is why 6V wiring is heavier gauge, double the voltage and you effectively double the current .... the starter motor spins like crazy on 12V, and works fine ... for the minute or so it takes to start the engine ... try running the 6V starter on 12V for an hour  Bill | | | | | Joined: Jun 2012 Posts: 1,749 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,749 | The speed changes might not be the same. The difference between say medium and high might be rather small. If that won't bother you the resistors will be just fine. The 12 Volt fan motor won't care much either. But, slow might be a bit fast. 6 Volt resistor switch will handle the current just fine.
Steve H
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