i took a volt meter and took one of the cables off the battery then put one lead from the volt meter on the battery and connected the other lead to the cable I took off, then i think i set it to the milli amp setting for load testing. once you re-attach the power the computers boot up and whatnot for a good minute or two and you see the power draws up to an amp for that duration then it should go down a bit. Mine was pulling nearly 900 milli amps which is quite a bit and enough to kill it in 2 days. i was sure it was my radio that I installed and lo and behold it was the back up cam attached to my radio. I attached the accessory wire to a hot wire by mistake, and so it was always on. once i fixed it the load dropped to about 600 m-amps or something ... its been a year anyways battery is great now.
you can use that method and just pull fuses one at a time starting with radio and back up cams and **** till you find the significant drop in power consumption
