Testing The Switch Box And Harness - MTD 188 Professional Shop Manual

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Testing the switch box and harness

IMPORTANT: If the mower is within the warranty
period, Do Not open the switch box. Replace the
entire switch box for warranty. Outside of war-
ranty, the switch box is serviceable.
1.
To test the components inside the switch box,
remove and open the switch box by:
1a. Remove the two mounting screws with a T-
25 torx driver. See Figure 2.18.
Figure 2.18
1b. Remove the five screws that hold the switch
assembly together. See Figure 2.19.
Remove these
screws
Figure 2.19
Remove these screws
Handle bar
grove
1c. Carefully separate the halves of the switch
box. Remove the side that fits against the
handle bar.. See Figure 2.20.
2.
Test the switch.
NOTE: The switch is a double pole single throw
switch. That means that it controls two separate
circuits at the same time.
2a. Mark and disconnect all four wires.
NOTE: Mark the wires to ensure they go back on
the proper spades. If the wires are put on wrong
the mower will not work properly, if at all.
2b. Test each circuit separately.
NOTE: Unlike most MTD switches, the terminals
that are in-line with each other, edge to edge,
are in the same circuit. See Figure 2.21.
Circuit 1
11
ELECTRICAL SYSTEM
Figure 2.20
Circuit 2
Figure 2.21

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