Hello everyone, first post here. I was cleaning my four wheeler the other day and removed my battery to clean out all the debris and when I hooked my battery back up and turned the key there was no power. I made sure the connections were all still good, checked all fuses, and then hooked up jumper cables from my truck battery to the four wheeler battery. I turned on the key and the power came on so I cranked it up.

I let it run for a good 15 minutes and when I went to put it in gear to move it the power went out and it died. I took the battery out and put it on a charger and it read full charge. I put the battery back in and still no power.

I could really use some help here. Any suggestions on what might be wrong?
It was running fine before I cleaned it. I had to drive it up to the front yard.