Figure 21. Multimeter Connection to Alternator Circuit 568

Maintenance of the M939 Series Vehicles
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52

for

voltage.

First, he disconnects the circuit 568 wire at

the

alternator.

Using the multimeter, set on the 50 volt range,

connects the meter positive lead to the circuit 568 wire and

the

negative lead to the vehicle chassis for a ground (figure 21).

FIGURE 21.

MULTIMETER CONNECTION TO

ALTERNATOR CIRCUIT 568.

Once the meter has been properly connected and all meter switches are

properly positioned, SSG Heatherly places the vehicle battery switch

to the ON position.

The meter should indicate a voltage reading,

which it does. Since the indicated voltage reading is not equal to

battery voltage SSG Heatherly will proceed with testing.

Now SSG Heatherly touches the positive meter lead to circuit

5, on the alternator terminal as shown in figure 22 (on the

following page).

At this point the meter should indicate

battery

voltage.

Since

battery

voltage

not

indicated

the

meter,

SSG

Heatherly

will

continue

with

testing.