Test 74 - Test Run Circuit; Test 75 - Test Crank Circuit; Test 76 - Check Battery Charger Supply Voltage - Generac Power Systems CorePower Repair Manual

Section 4.5
Diagnostic Tests
Results
1. Compare the results of Step 3 with Table 9.
a. If the VOM indicated CONTINUITY at Test Point 1
proceed to Test 67
b. If the VOM indicated CONTINUITY at Test Point 2
proceed to Test 68
c. If the VOM indicated CONTINUITY at Test Point 3
proceed to Test 69
d. If the VOM indicated proper resistance values at all Test
Points, replace the controller
Table 10. Test 73 Results
Test Point Pin Location
1 J2 Pin 4
2 J2 Pin 11
3 J2 Pin 8
TEST 74 – TEST RUN CIRCUIT
Discussion
Wire 14 provides 12 VDC during cranking and running. If the
VOM indicated CONTINUITY in the previous test, one of the
possible causes could be a faulty relay or solenoid.
Procedure
1. Set a Volt-Ohm-Milliammeter (VOM) to measure
resistance.
2. Disconnect Wire 14 from the fuel solenoid (FS)
3. Connect one meter test lead to the FS terminal from
which Wire 14 was removed. Connect the other meter
test lead to the ground terminal, measure and record the
resistance.
Results
1. If the VOM indicated 16 ohms of resistance in Step 3, a
short to ground exists on Wire 14 between the FS and the
J2 connector. Repair and replace as needed.
2. If the VOM indicated CONTINUITY in Step 3, replace the FS
Results
1. If the VOM indicated CONTINUITY in Step 3, replace the
FS solenoid.
2. If the VOM indicated CONTINUITY in Step 4, replace the
CS solenoid.
3. Refer to Table 8 and if the VOM indicated the correct
resistance for the component, a short to ground exists on
Wire 14. Repair and replace Wire 14 as needed.
Page 76
Circuit Result
Wire 14
Wire 56
Wire 15B
PART 4
TEST 75 – TEST CRANK CIRCUIT
Discussion
Wire 56 provides 12 VDC during cranking only. If the VOM
indicated CONTINUITY in the previous test, one of the possible
causes could be a faulty relay or solenoid.
Procedure
1. Set a Volt-Ohm-Milliammeter (VOM) to measure
resistance.
2. Disconnect Wire 56 from the starter contactor (SC) and
disconnect the choke solenoid (CS)
3. Connect one meter test lead to the SC terminal from
which Wire 56 was removed. Connect the other meter
test lead to the ground terminal, measure and record the
resistance.
4. Refer to Figure 49 in reference to the CS connector.
Connect one meter test lead to Pin 1 and the other meter
test lead to Pin 2, measure and record the resistance.
Results
1. If the VOM indicated 4 ohms of resistance in Step 3, a
short to ground exists on Wire 56 between the SC and the
J2 connector. Repair or replace as needed.
2. If the VOM indicated CONTINUITY in Step 3, replace the SC
TEST 76 – CHECK BATTERY CHARGER
SUPPLY VOLTAGE
Discussion
The battery charger is supplied with 120 VAC. The output of
the battery charger is 13.4 VDC (2.5A).
Procedure
Refer to Figure 62.
1. Set VOM to measure AC voltage.
2. Measure across points A and B. 120 VAC should be
measured.
a. If 120 VAC is not measured, verify that load source
voltage is available, and that the duplex circuit breaker
in ON.
b. If 120 VAC is measured, proceed to Step 3.
3. Measure across points C and D. 120 VAC should be
measured.
a. If 120 VAC is not measured, repair or replace Wire
BC LINE or BC 00 between the load center and the
generator.
b. If 120 VAC is measured, refer to Flow Chart.
ENGINE/DC CONTROL