RESISTANCE TEST -726280297

TM 9-2320-364-20-1

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts 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 dis-

connecting connectors.

While applying torque to nut, hold screw with

wrench or damage to battery may occur.

RESISTANCE TEST

(1) Remove battery box cover

(TM 9-2320-364-10).

(2) Remove nut, washer, lockwasher,

wire 240 and 241 from battery.

Discard lockwasher.

(3) Remove two mounting screws and

heat shield from DDEC ECM.

(4) Disconnect power harness

connector MC17 from DDEC ECM

with connector remover.

(5) Read resistance between wires 417

and 439 at vehicle harness

connector MC18, terminals D2

and B3.

(a) If 10,000 ohms or less are

present, repair wires 417 and

439. (See schematic Fig 2-3) or

notify DS Maintenance and

perform Steps (7) through (12)

below.

(b) If more than 10,000 ohms are

present, perform Step (6) below.

(6) Read resistance between wire 417

on vehicle harness connector

MC18, terminal D2 and wires 241,

150 and 240, terminals A, B, D, E

or F.

(a) If more than 10,000 ohms are

present, repair wires 241, 150

and/or 240 (see schematic Fig

2-1) or notify DS Maintenance

and perform Steps (7) through

(12) below.

(b) If 10,000 ohms or less are

present, wires 241, 150 and 240

are OK.

(7) Connect power harness connector

MC17.

(8) Install heat shield with two mounting

screws to DDEC ECM.

(9) Connect wires 240/241 to battery

with lockwasher, washer and nut.

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

(11) Apply corrosion preventive compound

on nut.

(12) Install battery box cover.

2-227