Engine Wiring Harness - Briggs & Stratton 405777 Series Manual

ENGINE WIRING HARNESS

The engine wiring harness consists of a ground wire with a
diode for each armature and a separate wire for the
carburetor solenoid, Fig. 9. The engine wiring harness is
connected to the wiring harness provided by the equipment
manufacturer. A raised rib on the polarized connector
indicates the ground side.
See engine wiring harness diagram, page 5.
Testing Ground Wires
The Digital Multimeter, Tool #19464 is recommended to
test the ground wires, Fig. 10. The digital multimeter is
available from your Briggs & Stratton source of supply.
The following test will be made with the meter in the
(Diode Test) position.
In the Diode Test position, the meter will display the forward
voltage drop across the diode(s). If the voltage drop is less
than 0.7 volts, the meter will "Beep" once as well as display
the voltage drop. A continuous tone indicates continuity
(shorted diode) An incomplete circuit (open diode) will be
displayed as "OL."
1. Insert RED test lead into
2. Insert BLACK test lead into
3. Rotate selector to
4. Insert RED test lead clip into connector "A" (black wire),
Fig. 11. Leave attached for remainder of test.
5. Touch BLACK test lead probe to terminal "B."
a. If meter "Beeps" once, diode is OK.
b. If meter makes a continuous tone, diode is defec-
tive (shorted). Replace ground harness.
c. If meter displays "OL," diode is defective (open).
Replace ground harness.
6. Now repeat test for terminal ''C." Results must be the
same.
See Diode Failure Diagnosis on page 5.
4
TSM
receptacle in meter.
receptacle in meter.
(Diode Test) position.
GROUND
EYELET
DIODES
TO ARMATURES
Fig. 9 − Engine Wiring Harness
Fig. 10 − Digital Multimeter − Tool #19357 or #19390
"A"
POLARIZED
CONNECTOR
Fig. 11 − Testing Ground Wire
SOLENOID
CONNECTOR
POLARIZED
CONNECTOR
ARMATURE "B"
TERMINALS
"C"