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300 MAINTENANCE AND LUBRICATION
Note:
The tachometer output and speedometer output are 50% duty cycle,
Transistor-Transistor Logic (TTL) compatible, square wave signals that are calibrated
to provide a standard pulse rate of 12 pulses per engine revolution for the tachometer
output and 30,000 pulses per mile for the speedometer output. TTL compatibility of
these outputs may be affected by other devices connected to these outputs.
Tachometer (RPM) Output
This terminal is to be used for devices requiring information for engine speed
signals. (See the Warning and Note above.)
Speedometer (MPH) Output
This terminal is to be used for devices requiring information for vehicle speed
signals. (See the Warning and Note above.)
SAE/ATA J1708 Posts (Serial Links A and B)
This is a serial communication interface. It conforms to the SAE/ATA
J1708 Recommended Practice for Serial Data Communications Between
Microcomputer Systems in Heavy-Duty Vehicle Applications. (See the
Warning above.)
CB Radio Power Jack
The CB radio power jacks are located on the dashboard of the day cab, and
on the headliner of the sleeper.
Power Jack (+)
This is a 12-volt, switched battery connection. It is to be used
to power the vehicle’s CB radio. It is protected by a 15-amp circuit breaker and
will supply power when the key is in the ACCESSORY position or ON position.
Power Jack (-)
This is a ground connection. It is to be used as a power return
connection for the vehicle’s CB radio.
Body Builder Connectors
The Mack® Granite™ GU axle back chassis offers two optional body builder
interface connectors located inside the frame rail on the right-hand side of
the chassis behind the cab.
Summary of Contents for Granite GU Series
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Page 44: ...SAFETY INFORMATION 33 Advisory Label Locations On Vehicle Labels Found on Chassis C0029831 ...
Page 45: ...34 SAFETY INFORMATION C0028958 ...
Page 46: ...SAFETY INFORMATION 35 C0028959 ...
Page 47: ...36 SAFETY INFORMATION C0029013 1 Right Side Frame Rail 2 Hood Prop ...
Page 48: ...SAFETY INFORMATION 37 C0029014 ...
Page 49: ...38 SAFETY INFORMATION Labels Found on Driver Side Sun Visor C0029832 ...
Page 50: ...SAFETY INFORMATION 39 C0029016 ...
Page 58: ...SAFETY INFORMATION 47 C0029833 ...
Page 60: ...SAFETY INFORMATION 49 C0029834 ...
Page 62: ...SAFETY INFORMATION 51 C0029835 ...
Page 72: ...INSTRUMENTS AND CONTROLS 61 Panel B W3056238 ...
Page 81: ...70 INSTRUMENTS AND CONTROLS C0029141 ...
Page 82: ...INSTRUMENTS AND CONTROLS 71 Diagnostics W3036575 W3036576 W3036583 ...
Page 84: ...INSTRUMENTS AND CONTROLS 73 C0029144 ...
Page 113: ...102 INSTRUMENTS AND CONTROLS C0029240 C0029241 ...
Page 235: ...224 OPERATION C0029351 ...
Page 241: ...230 OPERATION C0029352 ...
Page 284: ...MAINTENANCE AND LUBRICATION 273 C0029851 C0029852 1 Towhook Access ...
Page 305: ...294 MAINTENANCE AND LUBRICATION C0029434 1 Front 2 Back ...
Page 317: ......