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HARDWARE AND WIRING
Average Current Draw
The maximum average current draw is listed in Table 3-77. This information should be used
to size the alternator.
Maximum Average Current Draw
(12 V Nominal Supply)
System
Crank
Idle
Full Load/Rated Speed
MCM – Engine Loads
1.0 A avg
21.0 A avg
25.0 A avg
CPC – Vehicle Loads*
18.0 A peak
55.0 A peak
55.0 A peak
* Vehicle loads are controlled by the OEMs who can best determine the total maximum current draw for
their installation.
Table 3-77
Maximum Average Current Draw
The current draw for a CPC con
fi
guration is listed in Table 3-78.
Con
fi
guration
Condition
Current
Ignition Off
<1 mA
CPC
Ignition On and Engine Stopped
120 mA
Table 3-78
Current Draw for CPC Con
fi
guration
The current draw for a MCM is listed in Table 3-79.
Con
fi
guration
Condition
Current
Ignition Off
<1 mA
MCM
Ignition On and Engine Stopped
400 mA
Table 3-79
Current Draw for MCM Con
fi
guration
Battery Isolator
A battery isolator is not required. However, some applications require a battery that is dedicated
to the engine and completely isolated from the rest of the vehicle. Commercially available battery
isolators can be used.
3-66
All information subject to change without notice.
(Rev. 01/07)
7SA827 0701
Copyright © 2007 DETROIT DIESEL CORPORATION