Service Manual

Part Numbers
Purpose
The float switch is wired into the starter motor circuit to prevent starting in a
low oil situation. It will not kill the engine once running!
How It Works
The float switch houses a small magnet which pulls the contacts closed
when the float is down. When the float is up, the contacts are open.
Testing
1. Verify that the flats on the switch body are vertical and the letters N.C.
are on the top side.
2. Disconnect the switch from the harness and test for continuity. The
switch should be open with the oil at a safe level. Note: If testing with a
VOM, expect to see some resistance when the switch is closed.
3. Drain the oil from the engine, then retest for continuity. The switch
should be closed (and will probably show some resistance which is
normal). If the switch fails either of these tests, it should be replaced.
TIPS FOR REMOVAL/INSTALLATION:
1. Drain oil before rotating switch.
2. Use a continuous motion when turning, stopping only with the flats
vertical.
3. Rotate by hand as soon as possible to prevent damage if the float
catches something.
4. Use a sealant on the threads when reinstalling.
5. Make sure that the flats are vertical and the letters N.C. are on the top
side!
Part Numbers
103990
Purpose
This component provides the proper switching for the starter, ignition, PTO,
safety, and accessory circuits if so equipped.
How It Works
Detents inside the switch give it three positions: off, run, and start. The start
position is spring loaded so the cylinder automatically returns to run once
the key is released.
Testing
1. Disconnect the switch from the wiring harness.
2. Verify the conditions in the table.
3. Check each of the terminals to ground. There should be no
continuity.
Switch
Float (kit)
(Kohler)
Switch
Ignition
Position Condition
Off None
Run B+I+A+R
Start B+S+I+R
Glossary
GLOSSARY
Demystification Guide 3-27