Generac 86640 - Manual (Page 96)

Introduction
Test numbers in the test procedures that follow corre­
spond to the numbered tests in the troubleshooting flow
charts of Pages 9.5-1 and 9.5-2.
Test 1- Check 10 Amp Circuit Breaker
Position
DISCUSSION:
Battery power must be available to the engine control
circuit board in order for engine cranking to occur. This power
is delivered to the circuit board via Wire 13, the 10 amp circuit
breaker and Wire 15. If the 10 amp breaker is open, cranking
will not be possible.
PROCEDURE:
Check if 10 amp breaker is set to “Off“ or "Open”. If it is
set to “Off" or "Open", reset it to its “On“ or "Closed" position.
RESULTS:
1. If the 10 amp breaker is set to “On" or "Closed", go on to
Test 2.
2. If the 10 amp breaker is set to "Off" or "Open", reset it to
its "On" or "Closed" position.
Test 2- Check Voltage at Starter Contac­
tor Battery Terminal
DISCUSSION:
See “reST/NG THE STARTER CONTACTOR' on
Pages 9.3-1 and 9.3-2.
RESULTS:
1. if battery voltage is read at the starter contactor battery
terminal, go on to Test 3.
2. If low or no voltage is indicated at starter contactor battery
terminal, go on to Test 4.
Test 3- Check Voltage at Starter Cable
Terminal
DISCUSSION:
See "TESTING THE STARTER CONTACTOR" on Pages
9.3-1 and 9.3-2.
RESULTS:
1. If low or no voltage is indicated at starter cable terminal
stud of starter contactor when start-stop switch is held at
"Start", go to Test 8.
2. If normal battery voltage is indicated at starter cable
terminal stud of the starter contactor when start-stop switch
Is set to “Start", but the engine will NOT crank, go to Test 6.
Test 4- Check Battery Cables
DISCUSSION:
See "TESTING'THE STARTER CONTACTOR" on Pages
9.3-1 and 9.3-2.
RESULTS:
Clean or replace battery cables as necessary. If battery
cables are good, go to Test 5.
Test 5- Check Battery
DISCUSSION:
If the engine will not crank, the unit battery may be
discharged or worn out. ',
PROCEDURE:
Use an automotive type battery hydrometer to test the
battery for (a) state of charge and (b) condition. Follow the
hydrometer manufacturer’s instructions carefully.
State of Charge: If the hydrometer used does not have
a “Percentage of Charge" scale, the following chart may be
used:
SPECIFIC GRAVITY PERCENTAGE OF CHARGE
1.260 ÏÔÜ95
1.230 7 s ^
T25S 5ÜÎ5
1.170 25^S
Condition: If the difference in specific gravity between
the highest and lowest reading cells is greater than 0.050 (50
points), the battery should be replaced.
RESULTS:
1. Recharge or replace battery as needed.
Test 6- Check Starter Cable
DISCUSSION:
When the start-stop switch is set to "Start", battery volt­
age should be available at the starter motor, indicating that
the starter contactor has energized and its contacts have
closed. If such voltMe was available at the starter contactor
(Test 3) but is NOT available to the starter motor terminal
stud, the starter cable (bètween the contactor and the starter)
is corroded or defective.
PROCEDURE:
Check for battery voltage at the starter motor terminal
stud when the start-stop switch Is set to "Starf.
RESULTS:
1. Clean or replace starter contactor to starter motor
cable as required.
2. If starter cable is good, go to Test 7.
Test 7- Check Starter Motor
DISCUSSION:
Refer to Section 9.3.
Test 8- Check Wire 56 Volts at Starter
Contactor
DISCUSSION:
When the start-stop switch is set to "Start", engine control
circuit board action should deliver battery voltage to the Wire
56 terminal of the starter contactor. The starter contactor
should then become energized and the engine should crank.
This test will determine if battery voltage Is available to
energize the starter contactor and initiate cranking.
Page 9.5-3