well I used the factory wire to run one pump . I T'ed off that line to actuate a second relay which has a straight feed off the bat. I measured the voltage for each pump . The factory wire feeds 11.5 volts and the Bat feed sees 13.0 volts. I'm not going to worry about the voltage difference . Later I may run a second relay but for now I'm sure there will be enough fuel for my power levels.