Problem 10 - 7.5 Amp (F1) Fuse Blowing; Troubleshooting Flowcharts - Guardian 4700 Repair Manual

INSTALL NEW
7.5 AMP FUSE
DISCONNECT WIRE 15
AT J3 TERMINAL FROM
ENGINE CONTROLLER
DOES FUSE BLOW?
FUSE IS GOOD BUT
BLOWS WHEN START /
STOP SWITCH IS
PRESSED
DISCONNECT WIRE 14 AT J2
TERMINAL ON ENGINE
CONTROLLER CIRCUIT BOARD
AND CHECK WIRE 14 FOR SHORT
TO GROUND.
IS CONTINUITY PRESENT?
NO
CHECK CHOKE
SOLENOID AND
STARTER
CONTACTOR
Problem 10 - 7.5A (F1) Fuse Blowing
FUSE BLOWS UPON
INSTALLATION
CIRCUIT BOARD.
YES
CHECK WIRE 15
FOR SHORT TO
GROUND
YES
STARTER CONTACTOR
PIN LOCATION J1-1
TEST TO GROUND
CHOKE SOLENOID
PIN LOCATION J1-2
TEST TO GROUND

TROUBLESHOOTING FLOWCHARTS

CHECK THAT FUSE
HOLDER IS NOT
GROUNDED
FAIL
REPLACE ENGINE
CONTROLLER
NO
CIRCUIT BOARD
CHECK REMOTE
HARNESS WIRE 15
FOR SHORT TO
GROUND
PERFORM RESISTANCE TESTS ON FUEL PUMP,
FUEL SOLENOID, CHOKE HEATER AND REMOTE
HARNESS WIRE 14 (SEE * BELOW).
ALSO CHECK WIRE 14 TO EACH COMPONENT
FOR SHORT TO GROUND.
*
CHECK FOR CONTINUITY TO FRAME GROUND.
CONNECT ONE TEST LEAD TO THE POSITIVE
WIRE FOR EACH COMPONENT. CONNECT THE
OTHER TEST LEAD TO FRAME GROUND.
RESISTANCE SHOULD BE MEASURED. IF
CONTINUITY "0" IS MEASURED TO GROUND,
THAT COMPONENT OR WIRE IS SHORTED.
ALSO, REFER TO THE INDIVIDUAL TESTS FOR
EACH COMPONENT IN SECTION 7, UNDER
"PROCEDURE - SHORT TO GROUND."
REPLACE COMPONENT OR WIRE
CHECK WIRE 56
FAIL
SHORT TO
GROUND
CHECK WIRE 90
FAIL
SHORT TO
GROUND
Section 6
PASS
REPLACE HOLDER
TEST 16 - CHECK
BATTERY CHARGE
RECTIFIER
REPAIR OR
REPLACE
COMPONENT
OR WIRE
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