Diagnosis Of Cranking System; Cranking Circuit - GMC G Service Manual

6D-22 ENGINE ELECTRICAL

DIAGNOSIS OF CRANKING SYSTEM

CRANKING CIRCUIT

BATTERY
Determine the condition of the battery. Refer to "Battery"
earlier in this section for battery diagnosis and testing.
WIRING
Inspect the circuit for damage. Inspect all connections to
the starter motor, solenoid, engine control switch, and bat­
tery, including all ground connections. Clean and tighten all
connections as required.
SOLENOID AND CONTROL SWITCHES
Check all switches to determine their condition. A vehi­
cle equipped with an automatic transmission has a neutral
start switch which allows the vehicle to be started in "PARK"
or "NEUTRAL." It is located on the steering column near the
floor. A vehicle with a manual transmission has a neutral
start switch attached to the clutch.
The P-truck with a 7.4L engine has a magnetic switch in
the cranking circuit (figure 29).
NO CRANKING, NO SOUND FROM SOLENOID
Figure 26 — Cranking System Diagnosis