2000 Jetta vr6 battery?

I have a 2000 Jetta vr6 and i installed a 12" sub with an amp (obviously) and a cap. I also installed new halo projector headlights with LEDs and HIDs. I installed the headlight about 2 months ago, and now the LEDS in the left headlight don"t work (and i paid $350 for the headlights so they are not cheap) all the time. The right ones work perfectly fine and the HIDs also work. Could it be the battery? (the battery is the same as the one that the instruction manual says to get). If it is, what battery should i get?? a higher voltage? Also, the battery hasn't been changed for about 2 years now
Answer:

No, it has absolutely nothing at all to do with the battery. Since most things work and only one does not, then that one thing is what is bad. It is the LEDs in the left headlight that went bad. Maybe they just came loose. But a battery is not used at all once you start the car. The rest of the time it is all running off the alternator. If you are worried you are drawing too much current, it is the alternator that has to be up graded to a larger output. And most batteries last 6 to 8 years.

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Other answers

No a battery cannot make a light work sometimes. That sounds like a crappy electrical connection. Did you do any splicing of wires(corrosion?) or some horrible crimp through splices(throw them away). Check the bulbs too, they can be bad and work ocassionally. ASE Cert Auto Tech, since 1978, 2003 GLI

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