i dunno id just have to hate to recharge a battery after every ride that will kill the battery fast wont it
The thing about creating 24 volts on a 12 volt system is going to cause you big trouble if this is what I'm reading? Like Moose said, good luck with that. You may start burning your ignition system and bulbs out running 24 volts. I wouldn't even think of doing it this way.
If you add a second battery and don't run lights all of the time? As you ride during the day you will build up a charge in both batteries. So both batteries will be building up when any accessories are not used. Either way, you definitely need to wire any extra battery added to what you already have in parallel.
The only draw back to adding two batteries in a Parallel circuit is. Both batteries will be charged at the same time and the same amount of charge. The problem comes when both batteries are being drawn down so much, they draw down at the same rate because of the extra lighting. You may (depending on how many amps the extra lights are drawing?) run into a point where the batteries run low because the alternator can no longer keep up with charging the batteries. You may loose the ability of the alternator to keep the ATV running. And this can shut you down in the middle of the woods (until you turn these extra lights off and allow the alternator to create enough amps to run the engine again).
If you do a ton of running at night, and feel the need to add a few extra lights? You are going to need a larger alternator (charging system) on your ATV. Extra lighting and a big amp draw will eventually (more sooner than later) load up the charging system on your ATV to the point it (the stator) will get so hot the alternator (stator) burns up.
Also remember. If you do add a heavier alternator? Remember to run heavy wires from battery to battery.
Hopefully I didn't read your question wrong? If so, it wouldn't be the first time. Sorry if I'm on the wrong page with things????