ELECTRICAL SYSTEM -680640218

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM

WARNING

When replacing fuses, make sure only fuses of correct amperage are

i n s t a l l e d . Failure to do so could result in injury to personnel or damage to

equipment.

NOTE

Before starting troubleshooting, check for bad wire connections, blown fuses, and

proper switch settings.

During troubleshooting of circuits containing lamps, fuses, or relays, first check

problem by replacing lamp, fuse, or relay with known good lamp, fuse, or relay.

This may save time and effort.

During troubleshooting, check all wiring In a circuit for damage (e.g., cuts, wear,

bubbling, burning, etc.).

Before performing voltage checks, make sure equipment is properly set up (e.g., to

check for voltage at turn signal, make sure vehicle MASTER disconnect switch and

ignition switch are ON and turn signal lever is switched to L or R position).

17. NO ELECTRICAL POWER.

NOTE

Refer to wiring diagram (page 3-90) for all wiring repair steps.

Step 1. Check batteries (TM 5-2420-220-10).

If batteries are bad, charge (TM 5-2420-224-10) or replace

(page 4-219) batteries.

If batteries are good, go to step 2.

Step 2. Check for +24 VDC between positive battery terminal (1) and negative

battery terminal (2) on batteries (3).

If +24 VDC is not present, repair interbattery connect cable (4).

If +24 VDC is present, go to step 3.

Step 3. Check for +24 VDC between positive battery cable (5) at frame positive stud

(6) and ground at negative battery terminal (2).

If +24 VDC is not present, repair positive battery cable.

If +24 VDC is present, go to step 4.