Service Manual

Starting Motor ISB, ISBe and QSB (Common Rail [...]
Page 13-24 Section 13 - Electrical Equipment - Group 13
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If the crankshaft does not rotate or requires more than the
normal effort to bar, check for an internal malfunction or a
problem with the drive unit and/or accessories.
If the engine cranking speed is too slow/will not crank at
all, and the engine rotates freely:
Make sure the wiring connections are clean, tight, and not
damaged.
Check the battery voltage. Refer to Procedure 013-007 in
Section 13.
Check the voltage at the starting motor during cranking. If
the voltage drops more than 2.4 VDC on a 12 volt system
and 4.8 VDC on a 24 volt system, check that all
connections are clean and tight.
If the cables are correct and the voltage drop exceeds the
limit, replace the starting motor.
Preparatory Steps
WARNING
Batteries can emit explosive gases. To reduce the
possibility of personal injury, always ventilate the
compartment before servicing the batteries. To
reduce the possibility of arcing, remove the negative
(-) battery cable first and attach the negative (-)
battery cable last.
• Disconnect the ground cable from the battery terminal.
Refer to the OEM service manual.
• Identify each wire with a tag indicating location on
starting motor.
• Remove the electrical connections from the starting
motor.