Ryobi RY48ZTR75 Service Manual page 23

TESTING THE CRUISE SWITCH
1. Disconnect Main Power from Mower.
2. DMM set to "Diode" mode.
3. Touch the leads where indicated. LED should light
4. Set DMM to Resistance mode. This is a latching switch.
Pressing the buttons alternates between open and closed.
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6.4V
5-6V