Service Manual

Part Numbers
KH10315
Purpose
This diode ensures that no battery voltage is applied to the ignition module.
How It Works
A diode is a “one-way valve", for current. It allows current to flow in one
direction, but not in the other. The specifications for the diode are IN4002GI
GP 8532. The banded end should go to the harness (away from the coil.)
Testing
1. Remove the diode assembly from the harness.
2. Test the diode for continuity first one way, then the other. It should
conduct in one direction, but not the other. If not, replace it.
Part Numbers
78-0040
Purpose
This gauge indicates fuel level.
How It Works
The meter movement moves proportional to the amount of resistance
provided by the fuel level sender in the tank. The movement is dampened
to compensate for movement of the fuel in the tank.
Testing
1. With the gauge still connected to the harness, turn the key to the “run’’
position.
2. Using a VOM set to a scale capable of reading 12 volts D.C., connect
the negative lead to ground to verify the conditions in the table.
If your voltage readings are different from above, check the fuel level
sender and the wiring. If all readings are correct, the gauge must be
replaced as it is not serviceable.
Part Numbers
78-0020, 113469, 94-3723
Purpose
The hourmeter keeps track of how long the key has been in the “run”
position.
How It Works
Since a normal clock might be affected by variations in voltage and
current, the hourmeter is made up of a combination of an electric “winder”
and a mechanical clock movement. When power is applied, a relay is
energized. The contact moves far enough to wind the movement. The
movement unwinds in about two seconds. As it finishes its rotation, it
re-energizes the relay so that the cycle can start over.
Testing
Verify that 12 volts is present across the two terminals when the key is on. If
so, and the meter is not running, replace the meter. It is a permanently
sealed unit.
Diode
(with leads)
(Kohler)
Gauge
Fuel
Gauge
Hourmeter
Diode Heat Shrink
Tubing
To Kill Switch
Or Off Position
Or Key switch
Coated
Fiberglass
Sleeving
Terminal
Terminal Reading
I 12 volts*
G 0 volts
S 2.5 volts tank full
S 7.5 volts tank empty
*All voltage readings should be within 20%
Glossary
GLOSSARY
Demystification Guide 3-9