Starter Cable And Ground Cable Tests; Current Draw Test; Neutral Safety Switch Test - Jeep 1979 CJ-5 Technical & Service Manual

STARTING SYSTEM 1F-5
OPEN
C I R C U I T
CIRCUIT
70444
Fig. 1 F - 3 Ohmmeter Check of Starter Solenoid
Starter Cable and Ground Cable Tests (Voltage Drop)
The voltage drop tests will determine if there is exces-
sive resistance in the high current circuit. When per-
forming these tests, it is important that the voltmeter be
connected to the terminals that the cables are connected
to instead of to the cables. For example, when checking
between battery and solenoid, the voltmeter probes
must touch the battery post and the solenoid threaded
stud.
Before Performing Tests
(1) Remove coil secondary wire from distributor
and ground coil wire.
(2) Place transmission in Neutral or Park and apply
parking brake.
(3) Be sure battery is fully charged.
Test Procedure
Follow the steps as outlined in the Starter Voltage
Drop Test DARS Charts.
Current Draw Test
(1) Prior to performing current draw test, battery
m u s t be fully charged as described in Chapter
ID—Batteries.
NOTE: The lower the available voltage, the higher the
amperage draw.
(2) Disconnect and ground ignition coil secondary
wire.
(3) Connect remote control starter switch between
battery positive terminal and S-terminal of starter
solenoid.
(4) Connect battery-starter tester leads as shown in
figure 1F-4. Operate remote control starter switch and
read voltage indicated on voltmeter while starter is
cranking engine.
Fig. 1F-4
Starter Motor Current Draw Test
NOTE: Do not operate for more than 15 seconds.
(5) Release remote control starter switch.
(6) Turn load control knob toward INCREASE
(clockwise) until voltmeter reading matches reading ob-
tained when starter was cranking engine.
Read the current draw on the ammeter scale. This is
the current being used by the starter under full-load
conditions. If the current draw is not within 180 to 220
amperes at room temperature, remove the starter motor
from the engine for bench testing.
NOTE: Do not consider the initial amperage draw that
is required to begin engine cranking. A very hot or very
cold engine may draw 400 to 600 amperes for the first
few revolutions. Take an amperage draw reading after
the starter has obtained its maximum rpm.
Neutral Safety Switch Test
(1) Insert voltmeter leads into switch with all
switch leads connected.