Originally posted by ajdulina:
You don't get 24v from two 12v sorces. it still 12v, but now you have a higher amp flow.
It doesn't work that way dude. Amp flow stays the same. It's the set resistance of an accessory's load, and the running voltage, that determines the amperage (current flow). You can hook a thousand parelleled wires going from 1000 12v batteries, hooking up to one load (one fan say), and the fan will only DRAW the rated current load of the fan (if running at it's 12v rating). Amps X Volts = Watts. And Voltage = Amps X resistance (E=IxR). Example: 12v = ____amps X .8 ohms resistance, so what is the amperage of the circuit? It would be 15 amps that would flow through that circuit at 12v. Now if you start the car, and the voltage jumps to 14v (w/ alt), then it would be: 14v = 17.5 amps X .8 ohms. Do you see how that works? See more about ohms law here: http://www.eatel.net/~amptech/elecdisc/ohmslaw.htm
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