Yes, you have electric PTO. With that said it can be a few different things. I may not get them all but I will start with the most likely.
1. Carberator dirty not allowing extra fuel needed for blade usage.
2. Charging system not putting out enough voltage.
3. PTO switch bad
4. Brake, seat, neutral, or reverse safety switch not working correctly.
1. Remove and clean carb.Dirty carb
Down and dirty:
https://www.youtube.com/watch?v=VBL-BUj0c6E
More technical:
https://www.youtube.com/watch?v=nAk_WDt3AD8
2. Check voltage at the battery with the engine at full speed. 13.7 or so.
3. Check voltage at PTO wire connector when PTO button is in on position and disconnected from PTO. Whatever voltage at the battery is.
4. Check all switches for continuity. Each switch can be a double switch so test with that in mind. Remember that they will be open in one position and closed in the other.