Chrysler RAM TRUCK 2500 1994 Service Manual page 325

8A - 10 ELECTRICAL
•
E N G I N E S T A R T E R MOTOR T E S T P R O C E D U R E S
INDEX
page
General Information 10
Starter Control Circuit Tests 12
Starter Feed Circuit Tests - (Voltage Drop Method) . 11
GENERAL INFORMATION
The starting system consists of an:
• ignition switch
• starter relay
• park/neutral position switch (automatic transmis­
sion)
• clutch switch (manual transmission)
• wiring harness
• battery
• starter motor with an integral solenoid.
These components form 2 separate circuits. A high
amperage circuit that feeds the starter motor up to
375 amps-gas engine; 700 amps-diesel engine, and a
control circuit that operates on less than 20 amps
(Fig. 1).
IGNITION SWITCH
OUTCH I
SWITCH I
^ f f PARK/NEUTRAL POSITION I
II SWITCH I
MOTOR -
S 1
A R J
E R
S O t E N O I D l
STARTER RELAY
JT
Fig. 1 Starting System Components
STARTER SYSTEM DIAGNOSTIC INSPECTIONS
Before removing any unit from the starter motor
system for repair, perform the following inspections:
BATTERY INSPECTION
To determine condition of the battery, perform the
testing procedure outlined i n Battery Test Proce­
dures.
W I R I N G I N S P E C T I O N
Inspect wiring for damage. Inspect all connections
at the starter motor solenoid, park/neutral position
switch (if equipped), clutch switch (if equipped), igni-
page
Starter System Diagnostic Inspections
10
Starting System Cold Cranking Test . . . . . . . . . . . . 10
tion switch, starter relay, and battery (including all
ground connections). Clean and tighten all connec­
tions as required.
SOLENOID, RELAY AND IGNITION SWITCH
INSPECTION
Inspect the starter solenoid, starter relay and igni­
tion switch to determine their condition. Also, i f
equipped with automatic transmission, inspect condi­
tion of the park/neutral position switch; and, i f
equipped with manual transmission, inspect condi­
tion of the clutch switch. Testing information can be
found i n the following pages.
STARTING SYSTEM COLD CRANKING TEST
(1) Battery must first pass load and voltage drop
tests and be fully charged before proceeding. Refer to
Battery Test Procedures.
(2) Connect a suitable volt-ampere tester to the
battery terminals (Fig. 2). Refer to the operating in­
structions provided with the tester being used.
POSITIVE
CLAMP
948A-24
NEGATIVE
CLAMP
INDUCTION
AMMETER
CLAMP
Fig. 2 Volt-Amps Tester Connections (Typical)
(3) Fully engage parking brake, place manual
transmission i n NEUTRAL, automatic transmission
in PARK.
(4) Verify that all lamps and accessories are OFF.
(5) Remove automatic shutdown (ASD) relay from
power distribution center (PDC) on gas engine mod­
els, or disconnect fuel shutdown solenoid connector
(Fig. 3) on diesel engine models.