A light bulb is NOT a very good indicator of low voltage drains. It takes several amps to light a light bulb. Voltages of much less are enough to drain a battery.
Then you have no idea if the car battery or the ATV battery are any good to start with. Unhook them both and slow charge them. IF they will take charge that is half the battle. When/if you get them charged let them set for at least 24 hours unhooked from anything. Check the voltage and see what they still have. It should be well over 12 volts setting under no load. An even better test is a load test then. IF you have a tester than use it if not hook the battery up and start the ATV or even a car. Have your volt meter hooked up while you do this. The voltage should not drop below much below 10 volts while under starting load.
Now if the battery checks out good then put your volt meter in the negative cable side and see if it reads anything with everything shut off. It should not on that older machine. Some newer ones do draw a little bit for some of the electronics but not that older one.
If you show having a drain then unhook things until you find what is causing the drain. It could be a bad voltage regulator to a bad switch. IF you can't find it easily then and do not want to bother to find it, just disconnect the battery when your not using it. If you use it a lot then install a disconnect switch. If you do not then just unhook the battery cable when it is not in use.
I have an old gas power air compressor that has the starter/generator setup on it. It will slowly drain a battery. It only gets used maybe one every other month. I just unhook the cables on it. It is not worth the cost of a new regulator for the little time it gets used.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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