Generac Power Systems 53187 - Manual (Page 136)

SECTION 5.9
TROUBLESHOOTING TEST PROCEDURES
Test 8- Test Start/Stop Switch (Contin­
ued)
PROCEDURE (CONT’D);
2. Test and inspect the grounding lead (W ire 0), be­
tw een the start/stop sw itch and unit grounding stud.
Make sure the w ire is not open, shorted, dam aged, etc.
W ire m ust be properly attached.
3. Disconnect W ires 17 and 18 from the sw itch term i­
nals. Then, test the sw itch as follow s:
a. Set VOM to its "Rxl" scale and zero the m eter.
b. Connect VOM test leads across the sw itch W ire
18 term inal and the W ire 0 term inal.
(1) Set the sw itch to "Start". Meter should read
infinity".
(2) Set the sw itch to "Stop" and m eter should read
“continuity".
(3) Release the sw itch to its "Run" position. Meter
should read “infinity".
c. Connect the m eter test leads across the W ire 17
sw itch term inal and the W ire 0 term inal.
(1) Set the sw itch to "Start". Meter should read
"continuity".
(2) Set the sw itch to "Stop". M eter should read
"infinity".
(3) Release sw itch to its "Run" position. Meter
should read "infinity".
RESULTS:
1. If no voltage w as read at term inal 7 of the circuit
board in Test 6 and the start/stop sw itch passed its
tests, replace the engine control circuit board.
2. If sw itch tested bad, replace the sw itch.
18 17
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STOP START
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START STOP
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PARTS
ENGINE ELECTRICAL SYSTEM
Figure 3. Start/Stop Sw itch
PROCEDURE:
Make sure the circuit breaker Is closed (push in to
close). Use a VOM to determ ine if battery voltee is
available to the circuit breaker’s W ire 13 term inal, then,
check the W ire 15A term inal of the breaker. Battery
voltage should be indicated at both term inals.
RESULTS:
1. If battery voltage is read at the W ire 13 term inal but
not at the W ire 15A term inal, replace the start/stop
sw itch.
2. If the circuit breaker is good, go to Test 10.
Test 10- Check Wiring Between Battery
and Crank Relay
DISCUSSION:
In Test 4, if battery voltage w as not available to the
crank relay, it is possible that an open condition exists
in the w iring circuit betw een the battery and the crank
relay.
PROCEDURE:
Refer to the appropriate w iring diagram . Test and
inspect w ires betw een the battert and the crank relay.
RESULTS:
1. Repair, reconnect or replace open, shorted or dam ­
aged w ire(s) as necessary.
Test 11 - Test Starter Operation
DISCUSSION:
If Test 7 indicated that the starter contactor w as
functioning properly, but engine w ould not crank, the
starter m otor m ay be the problem .
PROCEDURE:
W hile holding the start/stop sw itch at "Start", check
that battery voltage is available to the starter m otor
term inal. If battery voltage is available, but engine does
not crank, the starter is probably defective.
To perform an operational test of the starter, see
Section 5.2, ENGINE CRANKING SYST EM .
RESULTS:
Repair or replace the starter as required.
Test 9- Test 10 Amp Circuit Breaker
(CB3)
DISCUSSION:
If battery voltage is NOT available to the crank relay
(CR1), it is possible that the 10 am p circuit breaker is
open or has failed open. The 10 am p circuit breaker is
located on the generator control panel. If the breaker is
open, cranking w ill not be possible.
Test 12- Check DC Volts at Terminal 1 of
Engine Control Circuit Board
DISCUSSIO'N:
This test applies to Types 2 and 3 DC control
system s only. For Type 1 system s, use Test 4.
If battery pow er is not available to the engine
control board, cranking w ill not be possible.
PAGE 5.9-4