Chrysler RAM TRUCK 2500 1994 Service Manual page 326

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ELECTRICAL 8A - 11
STARTING SYSTEM DIAGNOSIS
TEST CONDITIONS
• PLACE GEAR SELECTOR IN PARK OR NEUTRAL AND SET PARK BRAKE OR EQUIVALENT.
• VERIFY BATTERY STATE-OF-CHARGE AND CRANKING CAPACITY, SEE BATTERY SECTION.
• CLEAN BATTERY TOP, POSTS, A N D TERMINALS.
• VERIFY GENERATOR DRIVE BELT TENSION.
• REMOVE ASD RELAY FROM POWER DISTRIBUTION CENTER (GAS ENGINE).
• DISCONNECT FUEL SHUTDOWN SOLENOID CONNECTOR (DIESEL ENGINE).
SYMPTOM
STARTER FAILS T O
ENGAGE. NO SOUNDS
SYMPTOM
S T A R T E R F AI L S T O
E N G A G E S O L E N O I D
O R R E L A Y C L I C K S
SYMPTOM
S T A R T E R E N G A G E S ,
FAILS T O T U R N
E N G I N E . D O M E L I G H T
D I M S
SYMPTOM
S T A R T E R E N G A G E S
D R I V E C L U T C H
S P I N S O U T
SYMPTOM
S T A R T E R D O E S N O T
D I S E N G A G E A F T E R
E N G I N E STARTS
POSSIBLE CAUSE
S T A R T E R C O N T R O L
C I R C U I T FAULTY
I G N I T I O N S W I T C H
FAULTY
P A R K / N E U T R A L
P O S I T I O N
S W I T C H
( A U T O T R A N S . )
FAULTY
C L U T C H S W I T C H
FAULTY
( M A N . T R A N S . )
STARTER R E L A Y
FAULTY
STARTER ASSEMBLY
FAULTY
POSSIBLE CAUSE
R E S I S T A N C E T O O
H I G H I N S T A R T E R
F E E D C I R C U I T
STARTER C O N T R O L
C I R C U I T FAULTY
STARTER S O L E N O I D
FAULTY
STARTER ASSEMBLY
FAULTY
P O S S I B L E C A U S E
R E S I S T A N C E T O O
H I G H I N S T A R T E R
F E E D C I R C U I T
STARTER A S S E M B L Y
FAULTY
E N G I N E S E I Z E D
P O S S I B L E C A U S E
D R I V E C L U T C H FAULTY
B R O K E N T E E T H
O N R I N G G E A R
S T A R T E R A S S E M B L Y
FAULTY
POSSIBLE C A U S E
I G N I T I O N S W I T C H
FAULTY
S T A R T E R R E L A Y
FAULTY
S T A R T E R A S S E M B L Y
FAULTY
S T A R T E R
I M P R O P E R L Y
M O U N T E D
R E F E R T O
A P P R O P R I A T E G R O U P
A N D S E C T I O N O F T H I S
M A N U A L F O R P R O P E R
S E R V I C E A N D T E S T
P R O C E D U R E S F O R T H E
C O M P O N E N T S
I N V O L V E D
(6) Rotate and hold the ignition switch i n the
START position. Note cranking voltage and amper­
age.
(a) I f voltage reads above 9.6 volts and amperage
draw reads above 300 amps (gas engine), or 700
amps (diesel engine) go to Starter Feed Circuit
Tests.
(b) I f voltage reads 12.5 volts or greater and am­
perage reads below specifications, go to Starter
Control Circuit Tests.
A cold engine will increase starter motor cur­
rent and reduce battery voltage.
STARTER FEED CIRCUIT TESTS - (VOLTAGE DROP
METHOD)
The voltage drop tests will determine i f there is ex­
cessive resistance i n the high current circuit. When
performing these tests, i t is important that the volt-
J 9 4 8 A - 1 6
meter be connected to the terminals that the cables
are connected to, instead of to the cables themselves.
For example, when testing between the battery and
solenoid, touch the voltmeter test probes to the bat­
tery post and the solenoid threaded stud. The follow­
ing operation will require a voltmeter, accurate to
1/10 of a volt.
Before performing the tests, assure the following
procedures are accomplished:
• Remove ASD relay from PDC on gas engine mod­
els.
• Disconnect the fuel shutdown solenoid connector
(Fig. 3) on diesel engine models.
• A l l lamps and accessories are OFF.
• Transmission i n NEUTRAL (manual transmission)
or PARK (automatic transmission).
• Parking brake applied.
• Battery is fully charged (refer to Battery Test Pro­
cedures).