Viair 80 Amp Relay Wiring Diagram. (+12v when ignition is on*) supplied 40 amp fuse to constant +12v (battery) instructions 1. We have put together a kit to complete your 2nd battery installation, saving you time and money.

4.6 out of 5 stars. These directions will be easy to understand and implement. Print the wiring diagram off plus use highlighters to trace the signal.