York Compressor Onboard Air Wiring Diagram - Relay, Pressure Switch & 10A Fuse

This document is a simple hand-drawn (computer-drafted) wiring diagram showing how to wire an air compressor (labeled 'comp') to a vehicle's 12-volt electrical system using a standard automotive relay. The battery ('batt.') positive terminal feeds the relay, and the relay's switched output passes through a 10A fuse to the compressor, which is grounded on its other side. A pressure switch, grounded on one side, ties into the relay control circuit. A rocker switch, fed by a '12v igntion src.' (12V ignition source) and grounded, provides operator control of the relay. An inset detail (indicated by an arrow from the relay symbol) shows the standard relay pinout: pin 30 connects to battery, pin 87 to the compressor, pin 85 to the switch/control circuit, and pin 86 to ground, with a 12V ignition source feeding the control side. The diagram is useful for anyone installing an onboard air compressor (such as a York-style compressor conversion, per the filename) in a truck, showing power routing, fusing, grounding points, and relay terminal assignments. No vehicle year, make, model, part numbers, or wire colors are stated in the document itself.