Figure 3-12. Control compartment, terminal and control locations

(1) Turn off key switch. Isolate all power circuits

(-) to terminal B2+.

by placing thin cardboard between all pairs of contacts

(8) Measure for 4.5 to 5.5 volts from terminal

on all contractors except the EC contactor.

B2+ (- lead) to terminal I (+ lead).

(2) Remove control compartment cover panel

Note. If the reading of step 18) is

(TM 10-3930-620-12). Connect battery and turn on key

incorrect, test the diode bias block on

switch.

the power switch assembly (para 3-9).

(3) Measure for full battery voltage from terminal

(9) Measure voltage between terminal 3 (--)and

8 (-) to terminals B +, B2+, and C2+.

terminal B2+ as follows:

(4) Measure for full battery voltage from terminal

(a) Set directional control switch in forward

2 (-) to terminal B2+.

(F) position.

Note. If incorrect reading is obtained on

(b) With accelerator pedal up, voltmeter

terminals 2, 4. 6. or 7, test resistor

should read below zero.

Note. If the reading of step (b) or (c) is

(5) Measure for 0.14 volts from terminal 4 (-) to

incorrect, check the adjustment of the

terminal B2+.

speed potentiometer (para 3-6 f).

(6) Measure for 13 to 15 volts from terminal 6

to terminal B2+.

voltmeter should read approximately 4 volts.

(7) Measure for 9.5 to 10.5 volts from terminal 7

(d) Voltage reading should vary smoothly

3-22