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ELECTRICAL SYSTEMS
Testing
1.
Disconnect the switch from the wiring harness.
2.
Using a VOM or test lamp, test the continuity or
the terminals using the following diagrams (Figure
237).
Figure 237
4 - 10
"OFF" Position continuity
between terminals 8 and 7
only
"START" Position
continuity between
terminals 7-8 / 2-3 / 5-6
"RUN" Position continuity
between terminals 7-8 / 2-3
MVC-163art
Brake Switch
Purpose
The double pole plunger type switch has four terminals.
When the brake pedal is depressed, it completes the
safety circuit for start. In the "START" position, brake
pedal depressed, current flows to the fuel solenoid on
the engine and to the kill relay. On tractors with cruise
control, the cruise control circuit is connected to the
brake switch. When the brake pedal is depressed, the
switch opens and the cruise control magnet
disengages.
Location
The brake switch is located under the center access
plate, next to the park brake linkage (Figure 238).
Figure 238
How it Works
This double pole plunger switch has four terminals.
When the brake pedal is depressed, it pushes on the
plunger, closing and opening the contacts in the switch.
Testing
1.
Disconnect the switch from the wiring harness.
400XT Series Tractor Service Manual
MVC-839F
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