I have a pain in the ass draw on my battery in my 64 Chevy truck. It will last overnight,but not 2 days before it's dead. I have a switch on the ground, but sometimes forget to turn it off. I have done the test light on the negative side of the batt. and pulled each fuse, but the light never went out. Truck has new battery,voltage reg., and new altenator. Any ideas anyone????