Test 69 - Check Battery Charger Wiring; Test 70 - Check Wire 18 Continuity; Test 71 - Check N1 And N2 Voltage - Guardian 5240 Diagnostic Repair Manual

DC CONTROL
TEST 69 - CHECK BATTERY CHARGER
WIRING
DISCUSSION:
The three pin connector on the battery charger con-
nects the charger to ground and to battery power.
PROCEDURE:
1. Set the AUTO-OFF-MANUAL switch to OFF.
2. Disconnect the three pin connector from the battery
charger.
3. Set a VOM to measure resistance.
4. Connect one meter test lead to Wire 13 at the three pin
connector. Connect the other test lead to Wire 13 at
Fuse F2. CONTINUITY should be measured.
5. Connect one meter test lead to Wire 0 at the three pin
connector. Connect the other test lead to the ground
terminal. CONTINUITY should be measured.
RESULTS:
1. If CONTINUITY was NOT measured in Step 4, repair
or replace Wire 13 between the battery charger and
Fuse F1.
2. If CONTINUITY was NOT measured in Step 5, repair or
replace Wire 0 between the battery charger and frame
ground.

TEST 70 - CHECK WIRE 18 CONTINUITY

DISCUSSION:
During cranking and running the printed circuit board
from the ignition magnetos via Wire 18. If
receives a pulse
this signal is not received by the printed circuit board it will
shut down for no RPM sensing.
WIRE 18 CONNECTION
Figure 40. Wire 18 Connection 10/13/16 kW Units
PART 4
WIRE 18
CONNECTION
Figure 41. Wire 18 Connection 10/13/16 kW Units
PROCEDURE.
1. Set a VOM to measure resistance.
2. Remove Wire 18 from the stud connector for V-twin units
or disconnect the in-line bullet connector for single cylin-
der engine units. Disconnect the J1 Connector from the
printed circuit board.
3. Verify the continuity of Wire 18. Connect one meter test
lead to Wire 18 removed from the stud connector or
bullet connector. Connect the other meter test lead to
Pin Location J1-5 for all models. Continuity should be
measured. If continuity was not measured verify proper
connection of the C1 Connector, repair or replace Wire
18 as needed.
RESULTS:
Refer to flow chart.

TEST 71 - CHECK N1 AND N2 VOLTAGE

DISCUSSION:
Loss of utility source voltage to the generator will initi-
ate a startup and transfer by the generator. Testing at
the control panel terminal strip will divide the system
in two, thereby reducing troubleshooting time.
PROCEDURE:
Note: Verify that Utility Source Voltage is present.
1. Set the AUTO-OFF-MANUAL switch to OFF.
2. Set a VOM to measure AC voltage.
3. Connect one test lead to Wire N1 at the terminal strip in
the generator control panel. Connect the other test lead to
Wire N2. Utility line-to-line voltage should be measured.
RESULTS:
1. If voltage was measured in Step 3, go to Test 65.
2. If voltage was not measured in Step 3, go to Test 28.
SECTION 4.4
DIAGNOSTIC TESTS
Page 123