ONE COMBINATION TAIL AND STOPLIGHT TAILLIGHT ON LOADER BACKHOES WITH SERIAL NUMBERS 319995 THRU 342573 DOES NOT WORK

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

9. ONE COMBINATION TAIL AND STOPLIGHT TAILLIGHT ON LOADER BACKHOES WITH SERIAL NUMBERS

319995 THRU 342573 DOES NOT WORK

WARNING

Although ignition lock switch must be on and battery ground cable connected to test electrical circuit

voltage, turn off ignition lock switch and disconnect battery ground cable before doing resistance tests or

replacing parts. This will keep you from getting shocked and prevent damage to parts and equipment.

Step 1.

Pull blue wire terminal (1) out of connector (2). Using multimeter set to RX1 scale, place red probe on

blue wire terminal (1) and black probe on taillight (3). Check for 0 ohm on multimeter.

If multimeter reads 0 ohm, repair yellow wire in rear light wiring harness (page 2-137).

Plug terminal (1) into connector (2).

If multimeter reads more than 0 ohm, go to step 2.

Step 2.

Disassemble combination tail and stoplights (page 2633). Using multimeter set to RX1 scale, place

red probe on lamp positive terminal (4) and black probe on lamp base (5). Check for 0 ohm on

multimeter. Move red probe to the other lamp positive terminal (6). Check for 0 ohm on multimeter.

If multimeter reads 0 ohm on both terminals (4 and 6), go to step 3.

If multimeter reads more than 0 ohms on either terminal (4 or 6), replace lamp and

assemble combination tail and stoplights (page 2-633). Plug terminal (1) into connector

(2).

Step 3.

Check lamp socket (7) and two lamp leads (8 and 9) for cracks, breaks, and corrosion.

If lamp socket (7) or lamp leads (8 and 9) are corro ded, clean using fine abrasive paper

(item 20, Appendix C). Assemble combination tail and stoplights (page 2633). Plug

terminal (1) into connector (2).

If lamp socket (7) is cracked or broken, replace combination tail and stoplight assembly

(page 2-633).

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