ELECTRICAL ACCESSOR Y CONNECTION POINTS

This MACK chassis electrically ready for convenient installation electrical Use the designated battery post (+12 ground buf fered RPM buf fered mi/h and the SAE/A T A J - 1708 post located the electrical equipment panel for the installation any electrical Each connection point described below

Battery Post (BA TT)

This a +12 unswitched battery power can used power external devices that require power all even when the ignition key turned OFF This source protected a - amp circuit breaker

Ignition Post (IGN)

This a +12 switched battery power can used power external devices that require power only when the ignition key This source protected a - amp circuit breaker

Ground Post (GND)

This a ground can used a power return connection for external

RPM Output

This a 50% duty 5 - volt transistor - transistor logic (TTL) square - wave signal that calibrated provide a standard pulse rate pulses per engine

Note : T ransistor - transistor logic compatible this output may fected other devices connected this output. Maximum rated current the TTL output T otal current draw all devices connected this output must not exceed 4 volts.

Mi/h Output

This a 50% duty 5 - volt TTL - square - wave signal that calibrated provide a standard pulse rate pulses per

Note : TTL compatibility this output may fected other devices connected this output. Maximum rated current the TTL output mA. T otal current draw all devices connected this output must not exceed 4

SAE/A T A J-1708 Posts (Series Link A and

This a serial communication conforms the SAE/A T A J - 1708

Recommended Practice for Serial Data

Communications Between Microcomputer Systems Heavy Duty V ehicle

Radio Power Jack (CB Radio (Located Dashboard)

This a +12 switched battery power used power the protected a - amp circuit breaker and will supply power only when the ignition key the

Radio Ground Jack (CB Radio (Located Dashboard)

This a ground used a power return connection for the radio.

See the following illustrations for the CTP and CXP electrical accessory connection points for electrical equipment panels.