Generac 86640 - Manual (Page 97)

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Test 8- Check Wire 56 Volts at Starter
Contactor (Continued)
ROCEDURE:
See "STARTER CONTACTOR" on Pages 9.3-1 and
9.3-2.
RESULTS:
1. If battery voltage is not Indicated, go to Test 10.
2. If normal battery voltage is Indicated In this test, but was
NOT indicated in Test 3, go to Test 9.
Test 9- Check Starter Contactor Ground
DISCUSSION:
A ground wire connects to one of the smaller starter
contactor terminals and to frame ground. If this wire is open
or if a good ground connection is not available, the starter
contactor will not energize.
PROCEDURE”
Test the starter contactor ground lead for "continuity".
RESULTS:
1. Repair, reconnect or replace the starter contactor ground
wire as necessary.
2. if the ground lead is good, replace the starter contactor.
Test 10. Check Wire 56
ISCUSSION:
if Wire 56, between the engine control circuit board and
the starter contactor, is open, cranking will not occur when
the start-stop switch is set to "Start".
PROCEDURE:
Inspect Wire 56 between the starter contactor and the
engine control circuit board. Test the wire for "continuity".
RESULTS:
1. Repair, reconnect or replace Wire 56 as required.
2. if Wire 56 is good, go to Test 11.
Test 12- Test Start-Stop Switch
DISCUSSION:
When the start-stop switch is set to "Start", switch action
must connect Wire 17 to ground or cranking will not occur, in
addition, when the switch is set to "Stop", Wire 18 must be
connected to ground or engine shutdown will not occur.
PROCEDURE:
1. Connect VOM test leads across the Wire 17 terminal of
switch and the Wire 0 (ground) terminal. Set Switch to "Start"
and meter should read^continuity". Set switch to "Stop" and
meter should read "infinity".
2. Connect the VOM test leads across Wire 18 terminal of
switch and Wire 0 terminal. Set switch to "Start" and VOM
should read "infinity". Set switch to "Stop" and meter should
read "continuity".
RESULTS:
1. Replace the start-stop switch if it fails the test.
2. if switch is good, go to Test 13.
Test 13. Check Power Supply to Circuit
Board
DISCUSSION:
In test 8, battery voltage was NOT available to the Wire
56 terminal of the starter contactor. Wire 56 was checked in
Test 10 and it was good. The 10 amp breaker was then tested,
as well as the start-stop switch, and both were good. The
engine control circuit board is left as a suspect.
PROCEDURE:
Connect a DC voltmeter across circuit board Pin #1 and
ground. Battery voltage should be indicated.
RESULTS:
if battery voltage is indicated, replace the engine control
circuit board.
NOTE: Perform Tests 14 through 21 If the enhgine cranks
normally, but will not start.
Test 11. Test 10 Amp Circuit Breaker
DISCUSSION:
Battery power must be available to the engine control
circuit board or cranking cannot occur, if the 10 amp breaker
has failed open, battery power will not be available to the
circuit board.
PROCEDURE:
Test the 10 amp breaker for continuity with the breaker
set to "On" or "Closed".
RESULTS:
1. Replace the 10 amp breaker, if it is defective,
if the 10 amp breaker is good, go to Test 12.
Test 14. Check Fuel Supply
DISCUSSION:
Orten, the most obvious cause(s) of a problem are overlooked
when troubleshooting.
PROCEDURE:
if the engine cranks but will not start, check the fuel
supply. Also make sure that any shutoff valve(s) in the fuel
supply lines are open.
RESULTS:
1. Replenish fuel supply as necessary.
2. if fuel supply is good but engine will not start, go to Test
15.
Page 9.5-4