[rpmerf]

For the headlights, I would relay them. You can get a kit, or if you are handy with wiring, it isn't too bad to wire up. Use 2 relays, one for high beams, one for low beams. I put them on the driver side fender. Wire into the headlight wires before the drivers side headlight and grabbed power from that junction block.

For the drain, try a parasitic load test. You can google around, theres tons of write ups and youtube videos.