My battery usually last 2-3 days after fully charging it on my Coolster atv and I realized today with the engine off, key turned to on and light set to off that both front and rear lights are lit extremly dim but enough to notice if you look at them I'm not sure if its the fact I have an after market harness or if its a fault in the wiring somewhere that its allowing them to be completley off. Anyone ever have an issue like this?

 

Could be that the light switch isn't switching off completely, or a bad earth on frame leading to whatever comes "on" with ignition switch (brake light?) Having to earth back through the lights. Your machine should not need charging anyway, as the bike's charging system should keep it topped up.

 

Thats what I was thinking maybe the light/kill/start control isn't grounded properly but I'd think it wouldn't work at all if it wasn't and the ground to engine Is fine otherwise i'd think it wouldn't start and as for the charging I believe it works cause after riding the battery has plenty of juice to fire it up but between lights possibly pulling power when key and engine are off i think it slowly drains it. I've changed a wireharness on a previous atv without these issues so I'm just not sure why all the lights are dimly lit and by dim i mean so dim that at night u it wouldnt provide any amount of light to see with but lit enough that u can see it during the day by looking at it

 

It would be the earth wire from the rear lights that would be the problem. This should be grounded to the frame somewhere. A brake switch also would need to be powering that rear light. Check with a multimeter for resistance across the light switch when switched off, and do the same for the brake light switches. Also check that earth point for the rear light. Once the ignition switch is off, the lights go out, so there shouldn't be any drain on the battery. Therefore either the battery is poor or the charging system isn't working, as well.

 

I'm not sure what was causing the issue but after I took a ride yesterday they suddenly work as they should but I did check charging by connecting multimeter to battery and holding the revs high and the battery did go from 12v to 13v so charging system is working as for grounds the only ground is mounted to engine which runs threw the harness to all connections