MAINTENANCE AND LUBRICA TION

Note: The tachometer output and speedometer output are 50% duty cycle, T ransistor - T ransistor Logic (TTL) square wave signals that are calibrated provide a standard pulse rate pulses per engine revolution for the tachometer output and pulses per mile for the speedometer TTL compatibility these outputs may fected other devices connected these outputs.

T achometer (RPM) Output

This terminal used for devices requiring information for engine speed (See the W arning and Note

Speedometer (MPH) Output

This terminal used for devices requiring information for vehicle speed signals. (See the W arning and Note above.)

SAE/A T A J1708 Posts (Serial Links A and

This a serial communication interface. conforms the SAE/A T A J1708 Recommended Practice for Serial Data Communications Between Microcomputer Systems Heavy - Duty V ehicle Applications. (See the W arning above.)

Caution

The electrical systems all MACK chassis include a cir cuit eaker located the ound cir 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 such frame engine ounding

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 Each connection point described below