Electric Fan Wiring Harness Kit w/ Relay Speedmaster planetary gear sets have

Speedmaster planetary gear sets have an extremely stout output shaft

Speedmaster Powerjection EFI systems use a number of sensors

all in one affordable set

These alternator brackets feature a stout billet aluminum construction and include all mounting hardware

these durable mounting blocks are precision-machined from billet aluminum

Electric Fan Wiring Harness Kit w/ Relay Speedmaster planetary gear sets haveSpeedmaster kits provide constant voltage, protect from voltage and amperage spikes, and keep fan(s) from feeding back through the system. These fan relay kits are a necessity if you're adding an on off switch to your electric fan circuit.