Problem 2- engine will not crank, Problem 3- engine cranks but will not start – Generac Power Systems NP-40G User Manual
Page 104
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Section 7.2- ENGINE DC CONTROL SYSTEM
Problem
2-
Engine Will Not Crank
FUSE
good
'
TEST 4- CHECK
BATTERY
GOOD.
TEST 8- CHECK
POWER SUPPLY
TO STARTER
MOTOR
1
BAD
1
LOW OR NO POWER
REPLACE BAD FUSE
RECHARGE OR REPLACE
BATTERY. REPAIR OR
REPLACE BAD CABLE(S)
TEST 9- CHECK
WIRE 56 POWER
TO STARTER
CONTACTOR
5(L
I
BAD.
TEST 10- CHECK
ENGINE
CONTROLLER
BOARD
POWER
SUPPLY
iBADi
TEST 11-TEST
TEST 12-TEST
STARTER
START-STOP
CONTACTOR
SWITCH
I GOOD•
YES
i
STOP TESTS
REPAIR OR
REPLACE
BAD WIRE(S)
iGOOD
:
REPLACE
► ENGINE
CONTROLLER
CIRCUIT
BOARD
POWER
SUPPLY
GOOD
DOES
ENGINE
CRANK?
NO
I
REPLACE
STARTER
BAD,
1^ REPLACE
STARTER
CONTACTOR
BAD I
1^ REPLACE BAD SWITCH
OR BAD WIRE 17
OR BAD GROUND WIRE
AS NECESSARY
Problem 3- Engine Cranks But Will Not Start
ENGINE STARTS NOW
1
PRIME
STILL
TEST 13- CHECK
FUEL
FUEL SUPPLY
SYSTEM
START
1
,GOOD■
ITEST14-CHECK I
FUEL RLTER
STOP TESTS
LOW FUEL LEVEL
BAD
1
1
REPLENISH FUEL SUPPLY
REPLACE FILTER
I GOOD
GO TO TEST
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