Unlock the seat from the ATV, pulling the seat-release lever on the right side of the ATV upwards. Pull the rear of the seat upwards and to the rear of the ATV until the catch tabs on the front of the seat disengage from the ATV's frame.
Disconnect the ATV's black, negative (-) battery cable from the battery, using a Phillips screwdriver to unscrew the battery's terminal bolt. Pull the negative cable away from the battery and set it away from the frame or any other metallic components.
Disconnect the red, positive (+) cable from battery, using a Phillips screwdriver to unscrew the battery terminal bolt. Follow the battery cable to the ATV's starter solenoid. Disconnect the positive battery cable from the starter solenoid, using an 8 mm wrench to remove the lock nut from the solenoid's terminal post. Remove the positive cable from the terminal post and pull the cable out of the ATV. Take note of the cable's routing from the battery to the starter solenoid.
Route the new positive battery cable through ATV's frame between the battery and the starter solenoid. Connect the battery cable to the starter solenoid's terminal post and secure it in place by tightening the lock nut with an 8 mm wrench.
Reconnect the battery cables to the battery's terminals, starting with the positive (+) cable followed by the negative (-) cable. Insert and tighten the terminal bolts with a Phillips screwdriver.
Slide the seat's catch tabs into the frame and lower the seat into position on the ATV. Press the rear of the seat downward until the seat-lock mechanism locks into place. Pull the seat upward slightly to ensure that the seat is completely secured.