TM-5-2350-262-20-1

ARMORED COMBAT EARTHMOVER (ACE), M9

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL; VOLUME 1 OF 3

TM-5-2350-262-20-1 - Page 346 of 776

TM 5-2350-262-20-1

3-336

Change 3

Ensure MASTER switch (1) is OFF.

Check continuity between heater motor ground stud (2)

and connector (3).

If an open

circuit is indicated, replace electrical lead (4), verify problem is solved.

If continuity is indicated, go to step 2.

Disconnect leads (5) and (6) from resistor electrical leads (7).

Turn MASTER switch (1) ON

and heater switch (8) alternately to HIGH and LOW.

Measure voltage at leads (5) and (6).

If minimum 24 VDC is present at leads (5) and (6), turn MASTER switch (1) OFF and

reconnect leads (5) and (6) to leads (7).

Go to step 3.

If no voltage is present at leads (5) and (6), go to step 4.

Disconnect lead (9) from heater motor lead (10).

Turn MASTER switch (1) ON and heater

switch (8) alternately to high and low.

Measure voltage at lead (9), turn MASTER switch (1)

OFF.

If voltage is present at lead (9), replace to heater motor (p 4-242.4), verify problem is solved.

If no voltage is present at lead (9), replace the heater resistor (p 4-242.4), verify problem is

solved.

5

Step 1.

Step 2.

Step 3.

3

4

2

10

9

8

6

7