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Parasitic drain question Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical DangerDan New User May 10, 2020, 12:28 PM Post #1 of 4 (1860 views) Parasitic drain question Sign In I have a 2006 Hummer H3 5 cylinder with about 133,000 miles. The car has an aftermarket radio, subwoofer, and amp. I noticed revently (Because the car was sitting a few days) that I had a parasitic draw on the battery so I tested it and here are the numbers. The battery is 3 years old and only holds 12 volts but I had it tested and they said it was good. I pulled off the negative terminal and checked the amp draw between the terminal and the battery stump. I know there will be some draw (.05A is acceptable), but I was reading .14A. I started pulling fuses and found that the RDO was pulling .01A which I think is ok. The Aux power 2 is pulling .05A which I think is due to the sound system in the car but is that normal? Last but not least, the BCM was drawing .06A. Does that mean my BCM is bad and is this something an amature mechanic can handle fixing? any info is greatly appreciated. Hammer Time Ultimate Carjunky / Moderator May 10, 2020, 12:36 PM Post #2 of 4 (1854 views) Re: Parasitic drain question Sign In Sounds to me like you never let the timers expire. Here is the proper procedure. You will need a digital ammeter and a jumper wire with clips on the ends to do this. First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 30 to 40 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. DangerDan New User May 10, 2020, 5:16 PM Post #3 of 4 (1844 views) Re: Parasitic drain question Sign In thanks for the input!. I did wait for the car to "go to sleep" before I took my reading (it goes from .75 to .14) and I followed the exact procedure you stated except for the jumper cables. I found the big power draws to be the BCM and auxiliary power 2 fuses. my question is could a new battery fix this and is .06 amps too much of a draw for the BCM. Also I will try the jumper cables tomorrow. Hammer Time Ultimate Carjunky / Moderator May 10, 2020, 5:22 PM Post #4 of 4 (1840 views) Re: Parasitic drain question Sign In No, a battery isn't going to change that although it probably needs one. That reading is slightly high but shouldn't be a problem if driven regularly. I'm betting if you waited a little longer it would go down even further. I've had vehicles that took 45min to an hour to totally reset all timers. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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