Troubleshooting The Stop Switch; To Test The Stop Switch - MTD P71 Series Shop Manual

P71 Series Vertical Shaft Engines

Troubleshooting the stop switch

To test the stop switch:

1. Remove the engine shroud.
2. Unplug the wire from the spade terminal on the
module.
3. Connect one probe of a Digital MultiMeter (DMM) to
the lead disconnected from the module.
4. Connect the other probe to a good ground point on
the engine.
5. Set the DMM to measure resistance.
NOTE: The reading should be near zero when the
bail released. A high reading (>1) is an
indication the switch may have burnt con-
tacts. See Figure 7.2.
6. Squeeze the safety bail.
NOTE: Resistance (Ohms) should be infinite (O.L).
See Figure 7.3.
NOTE: If there is continuity to ground, the stop
switch is shorted to ground.
NOTE: The lead going to the module is part of the
stop switch, if there is a short replace the
whole switch assembly.
72
Lead from stop switch
Figure 7.2
Figure 7.3
Safety bail squeezed