Amperage tips when wiring your Chevy. All Amped Up! ... This is a Bosch 30-amp relay and power terminal we created to feed switched power to multiple underhood electrical components.

A typical example would be a 30-amp relay used to control an electric fan. You could just wire the fan from the battery through a heavy-duty toggle switch on the dash using 10-gauge wire and take ...

Failsafe Fuel Pump Relay Wiring. ... so you can use a low-amp switch and small-gauge wire ... allowing battery positive power to flow directly through relay terminals 30 and 87 to the fuel pump.