TM-9-2320-328-13-P-1

HEMTT-BASED WATER TENDER (HEWATT)

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST); PART 1 OF 3

MARCH 2009

TM-9-2320-328-13-P-1 - Page 400 of 1318

TM 9-2320-328-13&P-1

0057-20

DRAFT

0057

Change 1

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HWT0877A

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WARNING

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ICON 3

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Remove rings, wristwatches, neck chains, and any other jewelry before working

around vehicle.

Jewelry can catch on equipment and cause serious injury.

Jewelry

and tools may short across electrical circuits and cause damage to equipment, or

severe burns or electrical shock to personnel.

.

Step 28.

Remove cab instrument panel A (WP 0205).

Remove relay 6 (WP 0244).

While an

assistant puts cab FOAM SYSTEM switch to off position (WP 0004), with a test lead

set, check for 22 to 28 VDC between cab power distribution wire harness wire 2831

(blue) at relay 6 connector, terminal 1 and a known good ground.

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If 22 to 28 VDC are not present, go to Step 30.

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Step 29.

Pull battery disconnect switch to off position (WP 0007).

With a test lead set, check for

continuity across cab power distribution wire harness wire 1640 (black) from relay 6

connector, terminal 2 to a known good ground.

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a.

If there is continuity, replace relay 6 (WP 0244).

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b.

If there is no continuity, replace cab power distribution wire harness

and block (WP 0280).

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MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION