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at the moment just looking at the fuel pumps to the switch panel as it being a race car batt's in the trunk, pumps in the rear, there is no motor so the up frt wiring has to wait.btw using arc panel if that helps 
Thats definatly a situation where you want to use a relay. Id put the relay in the trunk.
That way the pumps power feed will be a very short distance. Batt to pump through the relay.
VS sending power to the front first and then back to the back with a even larger wire gauge preferred or needed.
In this case you can energize the relay two ways.
You can send 12 volts to it from your arc switched panel. Or you can ground it from the front or through the arc panel if it has that capability.
To keep it simple I wouldnt use anything less then 12 gauge to feed the pump. To engergize the Relay from front to back. You could use 20 gauge or higher. A relay takes Miliamps to energize.
But instead of buying a a bunch of different gauge wireing sizes. 12 and 16 gauge spools should cover you. But, also take into consideration wire color for easier polarity identification.
Last edited by Sport440; 04/03/11 01:54 AM.
