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BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS
8A - 9
S T A R T E R T E S T P R O C E D U R E S ON V E H I C L E
INDEX
Page
Diagnostic Preparation
9
General Information
9
Page
Starter Control Circuit Tests
12
Starter Feed Circuit Tests
9
GENERAL INFORMATION
The s t a r t i n g system o n Dodge Trucks consists o f a n
i g n i t i o n s w i t c h , starter relay, n e u t r a l safety s w i t c h
(automatic transmission), w i r i n g harness, battery,
a n d starter motor w i t h a n i n t e g r a l solenoid. These
components f o r m 2 separate circuits. A h i g h amper-
age c i r c u i t t h a t feeds t h e starter motor u p t o 300 +
amps, and a control c i r c u i t t h a t operates o n less t h a n
20 amps (Fig. 1).
A
5
BATTERY
IGNITION SWITCH
3u
r
— ^
h AUTOMATIC TRANSMISSION I
J NEUTRAL SAFETY SWITCH I
MOTOR
STARTER
SOLENOID
STARTER RELAY
.
^
898A-14
Fig. 1 Starting System Components
DIAGNOSTIC PREPARATION
Before proceeding w i t h s t a r t i n g system diagnostics,
verify the f o l l o w i n g conditions:
(1) B a t t e r y top, posts, a n d t e r m i n a l s are clean.
(2) A l t e r n a t o r drive belt tension and condition.
(3) B a t t e r y state-of charge.
(4) B a t t e r y w i l l endure load test.
(5) B a t t e r y cable (+/-) connections a t t h e starter
motor and engine block a n d t h e i r condition.
(6) W i r i n g harness connector a n d t e r m i n a l condi-
t i o n .
(7) Properly grounded.
STARTER FEED CIRCUIT TESTS
The f o l l o w i n g procedure w i l l require a suitable
volt-ampere tester (Fig. 2) a n d a j u m p e r w i r e .
(1) Connect a suitable volt-ampere tester (Fig. 2) t o
t h e b a t t e r y t e r m i n a l s (Fig. 3), refer t o t h e operating
instructions provided w i t h t h e tester being used.
(2) Disconnect the d i s t r i b u t o r connector.
898Ar8
Fig. 2 Volt-Amps Tester (Typical)
POSITIVE
CLAMP
898A-15
NEGATIVE
CLAMP
INDUCTION
AMPMETER
CLAMP
Fig. 3 Volt-Amps Tester Connections (Typical)
(3) Verify t h a t a l l l i g h t s a n d accessories are O F F
and t h e transmission shift selector is i n P A R K (au-
tomatic) or N E U T R A L (manual) a n d set p a r k i n g
brake or equivalent.
(4) Rotate and hold the i g n i t i o n s w i t c h (key) i n the
S T A R T position. Observe t h e volt-amps tester ( F i g .
4).
(a) I f voltage reads above 9.6 volts a n d amper-
age draw reads above 250 amps, proceed t o starter
feed circuit resistance test.
(b) I f voltage reads 12.4 volts or greater a n d
amperage reads 0 to 10 amps, proceed t o starter
control circuit test.
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