When I first got the truck it had a 12v battery hooked up in the truck. I knew right away it was a 6v system so I bought a new 6v battery. I'm not sure if someone had tried to crank it before I got it with the 12v battery and did some damage or not? It wouldnt have cranked because of other issues that have since been resolved but before I took out the 12v battery I did turn the lights on and they worked fine but were bright. I never turned the truck over with that battery. It has only been cranked with the 6v and now runs fine but the lights dont work? Thanks for the help