Polaris RXL 650 Triple EFI

Just picked up a Polaris RXL 650 Triple EFI. Sled runs great, and starts first or second pull. I've read about these sleds and how a good battery is crucial with the correct voltage and everything, but my EFI seems to work great. I turn the key and hear the fuel being pumped into the fuel rails. I've also read how there is red beeping codes on the ecu box but that doesn't seem to happen when I start it or cut it off. I've also found the red beeping codes online. My main problem, is the lights. The gauges, headlight, and taillight are all very dim. I've read about this and it seems to be a voltage regulator or a broken or dirty wire connection somewhere. Could someone guide me on the process I should go about to check this? Where the voltage regulator is, and what I should do with it. Thanks.

Polaris RXL 650 Triple EFI