I recently installed some LED lights that I bought from tractor supply on my 2002 Rubicon. For the first few days they worked perfectly, I parked it for a few days and today I tried to turn it over and the battery was weak (but not dead) it was still strong enough to start it. I rode it around for 20 minutes, and I turned on the lights, and the motor died. I turned the lights off, and tried to crank it up again battery was completely dead. Pull the cord, fired right up. Turned the lights back on, and died again.

Things to know:
- I put the battery on the charger, and at complete charge it reads 12.87 v
- I tested the charging system, at idle the bike reads between 13.24-14.4, as I increase the RPM's the voltage drops.

All help will be appreciated

 

The bike is OK but you have a problem with either the lights or battery. The old lights would be about 36 watt each for the headlamps 21 for the brake light and 5 for the tail lamp(s), so total about 100w drain on the battery. LEDs use less watts for the same "brightness" but if you installed say bulbs consuming 200 watts, your alternator may not keep up. Alternatively you could have a "drain" somewhere on the new lights, i.e, a partial short to earth.

 

I'm going to guess battery, I put power to the LED through the factory high beam lights. So all that it is running is the 2 LED's and the main pod light on the handle bars.

 

A dead battery would not cause it to die when the lights are turned on.
The alternator itself puts out enough power to run the quad even with the battery dead or removed.
It sounds to me that the new lights are drawing more power than the alternator is producing and thereby killing the engine.
It's either a problem with the lights or the alternator

 

You did not put HID bulbs by mistake Those require a $125 Conversion Kit, I have them in my 350. Much more to it then a simple bulb change.

 

They are definitely LED bulbs, and if I disconnect the battery the alternator should keep the bike running?

 

Yes, the battery is only there to crank the engine and give it spark while starting.
After it starts, the alternator would give it enough electrical power to keep running without the battery.

 

So the alternator kept the bike running, put voltmeter on the leads and it was putting out right at 14.2 volts.

 

So I figured out it has nothing to do with the lights... After continuous riding for two hours the battery is drained, and it just dies while under load. Maybe the stator or regulator?

 

If the voltage reading is 14.2 the alternator and regulator are charging fine. You can get intermitent charging so keep checking, but it seems more like a faulty battery or a wiring drain. A wiring drain can be checked with an ammeter. Disconnect the positive battery lead and, with everything switched off, put an ammeter in between the positive lead and battery terminal. The reading should be under 0.2 amps. If you have a big enough meter (0 to 30 amp minimum) switch the ignition on and check the reading, shouldn't be more than about 4 amps.