Ignition; Wire Harness Check; Ignition Coil Testing; Removing And Installing Wire Harness - Generac Power Systems GTH760 Service Manual

SeCTIoN 2: IGNITIoN
SPARK PLUG
SPARK PLUG

wIre HArNeSS CHeCk

IGNITION COIL TESTING:

If ignition does not have spark, disconnect ground wire from
ignition ground stud on engine and re-check. If ignition now
has spark, check wire harness for pinched wires, broken insula-
tion or bad diode (if equipped). If there is no spark, proceed
to Removing Ignition Coil section.

REMOVING AND INSTALLING WIRE HARNESS:

1. Remove spark plug leads.
2. Remove intake manifold and cover intake ports with a
shop towel.
3. Remove rotating screen and blower housing.
4. Disconnect stop switch wire(s) at ignition coil(s).
5. Reverse order of above to install new wire harness.
REMOVING IGNITION COILS:
The condition of the ignition coils can be accurately diag-
nosed using an ignition spark tester (Generac P/N 0C5969) as
described in "TROUBLESHOOTING" Section 1.
1. Remove spark plug leads.
2. Remove intake manifold and cover intake ports with a
shop towel.
3. Remove rotating screen and blower housing.
4. Disconnect stop switch wire(s) at ignition coil(s).
5. Remove ignition coil screws and lift of ignition coil(s).
See Figure 2-5.
DIODE (BUILT INTO COIL)
GROUND
WIRE
HARNESS
DIODE (BUILT INTO COIL)
Figure 2-4. Engine Wiring Harness
Note: The flywheel does not need to be removed to
service ignition except to check the flywheel key.
INSTALL IGNITION COILS:
1. Turn flywheel so magnet is away from ignition coil.
2. Install ground wire onto tab terminal on ignition coil.
Note: Make sure wires are routed over ignition coil
mounting posts and away from flywheel.
3. Assemble ignition coil to engine, Figure 2-6.
a. Mounting holes in ignition coil are slotted. Push igni-
tion coil away from flywheel as far as possible and
tighten screws.
4. Repeat for second ignition coil.
5. See Adjust Ignition Coil Air Gap.
2-2
IGNITION GROUND WIRE
DIODE BUILT IN HARNESS
ON OLDER MODELS
Figure 2-5. Removing Ignition coil