Mack CHM 2010, Operator'S Handbook Manual

Page: 225 / 232

MAINTENANCE AND LUBRICATION 217
Electrical Accessory Connection Points
CAUTION
The electrical systems on all MACK
chassis include a circuit breaker located
in the ground circuit. Any additional
electrical components that may be added
MUST not be connected directly to
the battery or negative connection of
the starter. Doing so may defeat the
protection provided by this circuit breaker.
Components may be ground connected to
other locations, such as frame or engine
grounding points.
This MACK chassis is ready for convenient installation of electrical accessories. Use only
the designated CB jacks on the dashboard, or battery post (12 volts), ignition, ground post,
buffered tachometer (RPM) output, and buffered speedometer (MPH) output connections
available on the electrical equipment panel. Each connection point is described below.
Battery Post (BATT)
This is a 12-volt, unswitched battery power connection. It can be used to power external
devices that require power at all times, even when the key is turned off. This source is
protected by a 20-amp circuit breaker.
Ignition Post (IGN)
This is a 12-volt, switched battery power connection. It can be used to power external
devices that require power only when the key is turned on. This source is protected by
a 15-amp circuit breaker.
Ground Post (GND)
This is a ground connection. It can be used as a power return connection for external devices.