C2,TM
9-2320-211-20
Testing--Diesel
and
Starter Circuit
Multifuel
CAUTION
Prior to checking the starter cables for tight
connections, t h e g r o u n d s t r a p m u s t b e
removed from the vehicle batteries. This is
r e q u i r e d to eliminate shorting of tools on
the v e h i c l e f r a m e , w h i c h m a y c a u s e
d a m a g e and endanger personnel.
NOTE
Prior to making electrical checks on the
s t a r t e r . the condition of the batteries and
the electrical connections must be checked
to insure that the proper voltage and
amperage are available.
a . Description. The starter circuit tested in this
paragraph i n c l u d e s a s t a r t e r s w i t c h . a s t a r t e r
s o l e n o i d relay, and a starter motor as shown in
amperage draw and functioning of components, the
f o l l o w i n g checks should be made at the battery.
b. Starter Draw Check at Battery. Refer to
c. Starter
Amperage
Draw
Test.
NOTE
starter switch and observe the
(5) Close the
The starter amperage draw test is made at
readings, voltage 18 to 24 volts, and amperage 250 to 300
the starter to insure that the required
amps.
voltage and amperage are reaching the
(6) If voltage and amperage are correct when
s t a r t e r and are not lost through the con-
the starter circuit is closed, the starter circuits and
n e c t i n g points.
t h e connections are functioning properly.
(1)
Connect
voltmeter
leads
and
500-amp
(7) If voltage is present but the starter will not
s h u n t leads to the tester.
c r a n k , inspect the cable connections for a voltage
( 2 ) Place the voltage selector in the 50-volt
drop.
position, and connect the voltmeter negative lead to
( 8 ) If the amperage is too high, replace the
the battery or frame ground as illustrated in figure
s t a r t e r (refer to para 2-128). Do the same if the
2-26.
v o l t a g e is present, but no amperage shows on the
( 3 ) Disconnect the starter cable at the starter
meter.
and connect the large positive external shunt lead to
Electrical
Power
Loss
TestGasoline
t h e cable. Refer to figure 2-27.
Engine
( 4 ) Connect the large negative external shunt
T h e s e tests are made to insure that the required
lead and the voltmeter positive (+) lead to the
voltage and amperage are reaching the components
starter cable post on the starter. Refer to figure 2-
and are not lost through connecting cables and
27.
switches.
