TM 9-2320-211-20
ammeter shows a low charge rate of 1 to 5 a m p s .
connections, t h e g r o u n d s t r a p m u s t b e
This indicates the line switch is closed. Observe the
removed from the vehicle batteries to
voltmeter. This should be reading 22 to 25 volts.
eliminate shorting of tools on the vehicle
The line switch must close below the regulated
frame which could endanger personnel or
voltage (27.5 to 29 volts).
damage the vehicle.
(4) With the engine still at 1000 to 1200 rpm,
NOTE
turn the field rheostat counterclockwise and ob-
Prior to making electrical checks on the
serve the ammeter. The meter should move to the
starter, the battery condition and electrical
discharge side for about 10 to 12 amps, then to
connections must be checked to insure that
zero. This indicates that the line switch is open.
proper voltage and amperage are available.
(5) If the regulator will not meet the above
a. Description. The starter circuit tested in t h i s
test specifications, replace the regulator (para 2-
p a r a g r a p h includes a starter solenoid, a starter
132).
switch, and a starter motor as shown in figure 2-23.
To test the starter circuit for amperage draw and
f u n c t i o n i n g of components, the following checks
should be made at the battery.
CAUTION
Prior to checking the starter cables for tight
Figure 2-23. Starter circuit.
b. Starter Draw Check at Battery.
tester, and connect the light negative external shunt
lead to the negative external shunt terminal of the
(1) Disconnect the ground cable from the
battery post of the grounded battery.
tester.
(2) Connect the light positive external shunt
(3) Connect the heavy positive external shunt
lead to the positive external shunt terminal of the
lead to the ground cable as shown in figure 2-24.
