Electrical Accessory Connection Points CAUTION

The electrical systems all MACK chassis include a cir cuit eaker located the ound cir cuit. Any additional electrical components that may added MUST not connected dir ectly the battery negative connection the starter . Doing may defeat the otection ovided this cir cuit eaker . Components may ound connected other locations, such frame engine ounding points.

This MACK chassis ready for convenient installation electrical accessories. Use only the designated jacks the dashboard, battery post (12 volts), ignition, ground post, buf fered tachometer (RPM) output, and buf fered speedometer (MPH) output connections available the electrical equipment panel. Each connection point described below .

Battery Post (BA TT)

This avolt, unswitched battery power connection. can used power external devices that require power all times, even when the key turned This source protected a - amp circuit breaker .

Ignition Post (IGN)

This a - switched battery power can used power external devices that require power only when the key turned This source protected a - amp circuit breaker

Ground Post (GND)

This a ground connection. can used a power return connection for external devices.

The tachometer output, speedometer output, and serial links A and B e for specific hookups. These terminals should used only for their specified purposes and connection these terminals should done only a qualified service technician.