TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Starter Solenoid (013-019)
Section 13 - Electrical Equipment - Group 13
Page 13-33
Close the vehicle start switch and the very first reading is
the voltage drop. If you wait, the voltage reading will drop
rapidly as the solenoid heats up and raises the solenoid
resistance. Be certain to record the very first reading.
NOTE: The motor will not crank if there is no voltage
supplied to the motor.
Repeat the step with the multimeter connected between
the battery negative (-) and motor negative (-). Add the
voltages from the previous step and this step to get the
control circuit voltage drop. Values are included in the table
below.
With the hold-in and pull-in circuits both activated the maxi-
mum allowable voltage drop at 20C [68F] is:
VDC
Voltage Drop (maximum)
12
1.0 VDC
24
2.0 VDC
32
2.6 VDC
Solenoid Average Amperage Draw
Motor
VDC
PI & HI Amps
HI Amps
28MT
12
69
13
24
120
13
37MT
12
74
19
24
36
6
41/42MT
12
97
18
24
57
13
50MT
12
86
15
24
49
6
32
38
6
64
10
2
For 12 -DC systems, apply 10 VDC to the ``S'' terminal.
For 24-VDC systems, apply 20 VDC to the ``S'' terminal.
For some 32-VDC systems, apply 30 VDC to the ``S''
terminal.
For some 32-VDC and all 64-VDC systems, apply 30
VDC to the ``B+'' terminal.
Disconnect the battery.
L-1291
