Yes alter is rigth i allways start with my 10amp setting on my meter.And yes never do any large loads like turn on Ign,start or open doors while checking for draw.I open doors befor testing and close the door latchs with my pocket screw driver,so the bcm thinks the door are closed.and then i see it under a 10 amp draw.then ill go to a milli amp setting.today at work we had a Trailblazer with a large draw,found that the OnStar module was the problem.found this by disconnecting 1 module that a time.
On older cars could be a wire rubbing on the body,Alt,and mud in the started like Alter said.
Ive seen alarms do large draws,Lojack is the biggest drawer of all.
~Richard & The Goddess~
Current Mods: 2.5 BB Teraflex Lift, 35" Nittos, 16"X8" MB Wheels, On-Board Air, Flo Master Exhaust, Power Inverter (800w), Evap Canister Relocation, WOODS S. S. relocation bracket, WOODS Rear Axle, Mopar Hitch, CB, Happy Bunny mud flaps!