6.Make the connections to the Compressor (3) and the Electric Relay (5) as shown on the Wiring Diagram.

Always use vehicle terminal connectors (not supplied) on all connections. Never wrap wires around terminals as they could fall off. Connect terminal #30 on the Electric Relay (5) to a 30A fused circuit.

Note: Some vehicles may employ a positive ground. If this is the case, refer to Wiring Diagram Positive Ground. Pay attention to polarity. If the Compressor turns on and the Horns do not sound, reverse the Compressor connections (+ / -).

Caution: Use caution to prevent accidental short circuiting of power while performing installation.

Wiring Diagram Negative Ground

SKU 40134

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Harbor Freight Tools 40134 operating instructions Wiring Diagram Negative Ground