98 club car no power

[SHIFT664]

I have a 98 club car been sitting outside for about a month under my carport, tried charging and I got it to back up and start to go forward and stopped. this was after about 6 - 7 hrs charging, I pushed it back in the carport and hook the charger up and it was humming like it was charging, went outside just a lil bit ago and it wouldnt move, when I push on the gas pedal you can hear it clicking trying to do something but wont move under its own power.
Am I charging in the wrong setting as in tow or run, been charging in the tow position? Not sure if its correct but It ran just fine when I put it up for the winter and now my neighbor is buyingit and it wont go. Help Please
Thank you for all help and is appreciated,
Matt
http://i543.photobucket.com/albums/g...IMG_0122-1.jpg
battery compartment
do you all think maybe its just needing the post cleaned off?
Help please