Guardian 4389 Repair Manual page 39

AC GENERATORS
0
6
162
Figure 3. Voltage Regulator
4. Disconnect Wire 2 from the excitation circuit breaker
(CB2) and connect one test lead to that wire.
Disconnect Wire 6 from the voltage regulator and con-
nect the other test lead to that wire. (5th terminal from
top, double check wire number).
5. Set the AUTO-OFF-MANUAL switch to MANUAL. Once
the engine starts, record the AC voltage.
6. Set the AUTO-OFF-MANUAL switch to OFF. Reconnect
Wire 2 and Wire 6.
7. Disconnect Wire 11 from the voltage regulator and con-
nect one test lead to that wire. Disconnect Wire 22 from
the voltage regulator and connect the other test lead to
that wire (both wires are located at the top two terminals
of the voltage regulator, see Figure 3).
8. Set the AUTO-OFF-MANUAL switch to MANUAL. Once
the engine starts, record the AC voltage.
9. Set the AUTO-OFF-MANUAL switch to OFF. Reconnect
Wire 11 and Wire 22.
10.Set VOM to DC amperage.
11.Remove jumper lead connected to Wire 4 and Wire 15.
12.Connect one meter test lead to battery positive twelve-
volt supply Wire 15, located at the 15A fuse. Connect
the other meter test lead to Wire 4 (still disconnected
from previous tests). Measure and record static rotor
amp draw.
13.Set the AUTO-OFF-MANUAL switch to the MANUAL
position. Once the engine starts, repeat Step 12.
Measure and record running rotor amp draw with the
engine running.
14.Set the AUTO-OFF-MANUAL switch to OFF. Reconnect
Wire 4 to the voltage regulator.
PART 2
4
4
22
11
SECTION 2.4
DIAGNOSTIC TESTS
Page 37