Battery is charged but car is still not working,

do you still need tires, i can get you some

take a look at this manual page 4 steps 33-38 http://us.pegperego.com/admin/archive/manuals/JD_Gator_HPX_ENGLISH.pdf

i can get you one if you still need one

I can get you a battery and charger is you still need one

you can order a new one here www.powerwheelsoutlet.com

the battery is behind the front grille, you have to remove the screw in the middle and then pull out on the green plastic clips on each side then fold down

There is a small compartment on the front of the vehicle that has a cover and a long pin holds the battery it, on some of these models.

the gator toys don't have spark plugs

I would replace the high/low switch and the reverse switch. One time a replaced the high/low switch and the reverse switch quit on me 2 weeks later.
You can also get the Peg Perego Gator Shifter that upgrades the vehicle.
You can get the parts and repair help at this site
http://www.shopjandl.com/kids---baby-ride-on-toys-peg-perego-switches-and-shifters.html
They have helped me several times.
Hope this helps

You should be able to buy the battery at any auto parts store.
Call First!
There should be a trap door somewhere on the topside that will need to be unscrewed or pry-ed open.
Make sure you take the old battery to the auto parts store and have them test it to make sure that's the problem!
Often the metal drive and mechanisms on these toy trucks and cars gets rusted and is misdiagnosed as a battery problem in which case I would buy a couple of cans of WD40 lubricant or equivalent and spray on all the metal you can access then manually turn the wheels as much as possible!