RESISTANCE TEST -726280363

TM 9-2320-364-20-1

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical

circuits, a direct short may result. Damage to equipment, injury or death to personnel may occur.

Allow engine to cool before performing troubleshooting maintenance. If necessary use insulated pads

and gloves. Hot engine components will burn and cause personnel injury.

Corrosion inhibitor contains alkali. Do not get in eyes; wear goggles/safety glasses when using. Avoid contact

with skin. In case of contact, immediately wash area with soap and water. If eyes are contacted, flush eyes

with large amounts of water for at least 15 minutes and get immediate medical attention.

DDEC ECM connector terminals are easily damaged. Use care when connecting and disconnecting connectors.

While applying torque to nut, hold screw with wrench or damage to battery may occur.

RESISTANCE TEST

(1) Remove battery box cover

(TM 9-2302-364-10).

(2) Remove nut, washer, lockwasher and

wires 240/241 from battery. Discard

lockwasher.

(3) Remove two mounting screws and

heat shield from DDEC ECM.

(4) Disconnect power harness connector

MC17 with connector remover.

(5) Loosen screw and disconnect vehicle

harness connector MC18 at DDEC

ECM.

(6) Read resistance between engine

harness connector, terminal P2 and wire

439 at vehicle harness connector MC18,

terminal B3.

(a) If less than 10,000 ohms are present,

repair wire 439 (see schematic

Fig 2-1 and/or Fig 2-2) or notify DS

Maintenance and perform Steps (8)

through (17) below.

(b) If there are more than 10,000 ohms

present, wire 439 is OK. Perform

Step (7) below.

(7) Read resistance between engine

harness connector, terminal P2 and

wires 241 and 240 at power harness

connector MC17, terminals A, B, E and

(a) If less than 10,000 ohms are present,

repair wires 241 and/or 240 (see

schematic Fig 2-1 and/or Fig 2-2) or

notify DS Maintenance. Perform

Steps (8) through (17) below.

(b) If more than 10,000 ohms are

present, wires are OK. Go to Step 7

of this Fault.

(8) Connect engine harness connector to

DDEC ECM and tighten screw.

(9) Connect vehicle harness connector

MC18 to DDEC ECM and tighten screw.

(10) Connect power harness connector

MC17 to DDEC ECM.

(11) Install heat shield with two mounting

screws on DDEC ECM.

(12) Connect wires 240/241 to battery

with lockwasher, washer and nut.

(13) Tighten nut to 23 lb-ft (31 N.m).

(14) Apply corrosion preventive compound

on nut.

(15) Install battery box cover.

(16) Close top engine access cover.

(17) Install right front fender skirt

(Para 17-33).

2-293