| jrmbjm47 | -- 07-21-2011 @ 9:02 AM |
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I am trying to find the best way to convert my '48 Ford Deluxe power convertible top to 12 volt. I don't know if I should have the motor re-wound for 12 volt or can I use a voltage reducer. I am not sure haw many amps the motor draw when in operation. Any help or suggestions would be appreciated
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| TomO | -- 07-22-2011 @ 8:37 AM |
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I would have the motor converted to 12 volts. You can use a dropping resistor, but they generate a lot of heat. To find the correct size, install a 1 ohm 50 watt resistor in the circuit to the motor, operate the motor with a 6 volt source and measure the voltage across the resistor. Use Ohms Law to calculate the current and then to size the dropping resistor. http://www.the12volt.com/ohm/ohmslawcalculators.asp Tom
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| jrmbjm47 | -- 07-22-2011 @ 8:52 AM |
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I think you are right about having the motor converted to 12 Volt. The car is apart now and now would be the time to have it converted. I found a place in the Portland, OR area that can do the job. Not cheap, about $300 but I think that is the way I will go.Thanks
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| jrmbjm47 | -- 07-22-2011 @ 10:21 AM |
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What about just hooking the motor up to 12 volts, just like a 6 volt starter motor in a 12volt conversion. It will turn faster but I don't know how the increased speed will affect the hydraulic pump.
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| supereal | -- 07-23-2011 @ 10:00 AM |
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The motor that operates the original pump is very close to the starter type, but shouldn't be fed 12 volts. The current draw is too high for a dropping resistor. Most of the pump end of the unit sits in a reservoir filled with brake fluid, and the majority are in bad shape due to moisture collection. If the pump is operated at higher speed, it is very likely it will be destroyed. There are replacement original type pumps available, but they are very pricey. We have had much better luck installing an aftermarket pump, such as the one sold by Hydro-E-Lectric, and leaving the old pump in place for appearance. It is placed ahead of the spare tire in the trunk, where it can't be seen. You can obtain either a 6 or 12 volt model. That system uses automatic transmission fluid, a big improvement over brake fluid. It is very likely that the cylinders will also have to be replaced due to corrosion, and be sure you have the counterbalance springs in place to assist in raising the top.
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