Starter Feed Circuit Resistance Test; Starter Draw Tests; Test Battery Connection Resistance; Test Ground Circuit Resistance - Dodge D150 1990 Service Manual

8A - 10 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS
CAUTION: Do not overheat the starter motor or
draw the battery voltage below 9.6 volts during
cranking operations.
Q o
898A-21
Fig. 4 Starter Draw Tests
(c) I f t h e starter motor cranks the engine freely
a t times, b u t a problem w i t h the s t a r t i n g system is
s t i l l suspected, engage t h e starter several t i m e s
w h i l e observing the volt-ampere tester. A s t a r t i n g
system t h a t has a problem should f a i l w h i l e per-
f o r m i n g t h i s procedure.
(5) A f t e r s t a r t i n g system problems have been cor-
rected, v e r i f y the b a t t e r y state-of-charge (charge bat-
t e r y i f necessary). Disconnect a l l testing equipment
and j u m p e r wires and connect distributor. S t a r t the
vehicle several times t o assure the problem has been
corrected.
STARTER FEED CIRCUIT RESISTANCE TEST
Before proceeding w i t h t h i s operation, review D i a g -
nostic P r e p a r a t i o n a n d Starter Feed C i r c u i t Tests.
The f o l l o w i n g operation w i l l require a voltmeter, ac-
curate t o 1/10 of a volt.
(1) Disconnect the d i s t r i b u t o r cap and connector.
(2) W i t h a l l w i r i n g harness and components con-
nected properly, perform the following:
(a) Connect positive lead of the voltmeter t o t h e
battery negative post, and negative lead to t h e bat-
tery negative cable clamp (Fig. 5). Rotate a n d h o l d
the i g n i t i o n switch (key) i n the START position.
Observe t h e voltmeter. I f voltage is detected, cor-
rect poor contact between the cable clamp a n d post.
(b) Connect positive lead o f v o l t m e t e r t o t h e
b a t t e r y positive post, a n d negative lead t o t h e bat-
t e r y cable positive clamp (Fig. 5). Rotate a n d h o l d
t h e i g n i t i o n switch (key) i n the S T A R T position.
Observe t h e voltmeter. I f voltage i s detected, cor-
rect poor contact between the cable c l a m p a n d post.
(c) Connect positive lead of v o l t m e t e r to b a t t e r y
negative t e r m i n a l , a n d negative lead t o engine
block near t h e battery cable a t t a c h i n g p o i n t (Fig.
6).
VOLTMETER
BATTERY
898Arl7
Fig. 5 Test Battery Connection Resistance
VOLTMETER
E N G I N E
v
^J^snm
G R O U N D \ B A T T E R Y ^ r f V
Fig. 6 Test Ground Circuit Resistance
898A-18