Ryobi RY48ZTR75 Service Manual page 18

BATTERY VOLTAGE TEST
1. Set DMM to "DC Volt" mode.
2. Turn mower on.
3. Pull PTO switch up (Power Take Off/Blade Engage knob) to load the battery for
more accurate measurement.
4. Place RED DMM probes indicated by red arrow, BLACK probe by black arrow
Charge Indicator LED (LED should blink in
similar pattern to charger when charger is
connected)
Charger Interlock
Note: New mowers have a different
pattern of Indexing pin. When requesting
repair parts, send a picture of this
connector to ensure proper parts
For the charger and charge port
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Note: If a valid voltage cannot be
read, the electronics built into the
charge port may be bad. In this
event, find the blue connector
which connects directly to the
batteries. Disconnect it, and
measure battery voltage