Re: Blades will not engage/rotate
If the battery is weak, it will pull down the voltage on the entire system. I think that may well be your problem. Before you do any troubleshooting, you need to start with a fully charged battery. Please fully charge the battery, then give it a another try. The charging systems on these machines will keep a battery in good shape charged, but do not have the fortitude to charge a dead battery, or to run accessories like the PTO if the battery is weak or defective. You might be in the market for a new battery at this point. How old is your battery?
Your charging system may have quit on you also, from the description you gave. It needs to be checked out - with a fully charged battery.
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Living in The Land Of The Free - because of The Brave!
2006 Conquest, 54" deck, Vanguard engine