need 12 volts ?
What your looking for is a dc to dc convertor.
Cost will vary dependind how much amperage.
how it works:
it is wired thru your ignition switch for control.
It is hooked to whatever your total available voltage is.
fused.
The whole job should run you about $ 145.00 for 15 amps.
Your lights should also be hooked up thru this device, it will provide greater range and longer battery life.
transformers do not work in DC circuits.
Resistors just suck up more juice.
contact me if you need more help!
Gerry B
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