I have posted a procedure below that will help you isolate the actual drain. Ok I was having the same issue with my 2002 Chevy Tahoe, so I followed your suggestion and pulled the On Star system from behind the dash, but now I noticed that I have no sound from the radio. He said take it to a technician to trace the problem, but figured I could nose around a little myself. I usually reside over at rec. Just started all of a sudden. My daughters Tahoe has started draining the battery when sitting for 3 or 4 days. With this setup, 1 volt means 1 amp, 1 millivolt means 1 milliamp, etc.
Dusty The first thing to do is to see if you can get the car checked out with a scanner, this is to see if there are any trouble codes stored in the computer memory. Started checking drain with 10A setting and fried my meter again after checking about 8 fuses. These tests will give us an idea of what's going on. Since some asked, my Trailblazer is a 4x4 with no aftermarket options. Note: I once had a glow plug module on a Ford Power Stroke diesel drawing 11 amps, which would drain its two heavy-duty batteries in about 12 hours. Compare this to the multimeter milliampere reading taken in the previous step. Temperatures above the moderate climate of 25°C 77°F increase the battery's internal self discharge.
On future cars of course. Posted on Sep 04, 2009 Hi, there is a park relay in middle of the interior relay box under the dash to the left of the steering column. Sometimes when you turn the key off and the lights on the dash light up, start moving the wire harnesses of the car under the hood, if you have a problem then wiggling the harness will make the light or lights go out or flicker. I've had battery issues for years, as this vehicle has not been regularly driven since 2006 - mostly used to tow a boat. Refer to Battery Usage when testing the battery.
I suppose the next thing to do would be to try to find grounds to the chassis, and see if any are loose. I have checked pretty much everything that is aftermarket to make sure it is off when the key is off. Once you find the fuse that causes the amperage draw to go away, you at least know what circuit the draw is coming from. Rinse it off with clean water and re-check. I feel like I'm getting a good spark, so like your spark test idea.
I think it should be around 50 milliamps. Or if I would leave the flashers on for more than a couple of minutes with the truck not running. They can find a drain, but pulling fuses one at a time do not eliminate the drain. Mar 24, 2011 Knock sensor is located on side of engine block screwed into a block coolant drain, your best access is from underneath the vehicle. Start pulling fuses from the 'convenience center' inside under the dash until the bulb dims noticeably.
I checked all circuits and could not find any draw on any fuse that was not normal. How the problem was resolved: I found that my digital ammeter had nearly the full battery voltage drop across it while reading 92 milliamps. I already ruled out alternator and a bunch of other things via engine fuse box like starter which sounds like it might be struggling , but didn't check everything. If that solves the problem you need a relay. Does anybody have any idea what this problem is? If it does have the case draw, it's basically like having a big resistor across the terminals all the time, which doesn't show up when doing the standard parasitic draw test. How about a change in the logic so this cannot happen? Just un plug them, that should fix your problem. When the ignition is turned on, all of the on-board modules are awakened and begin performing their assigned functions.
The reason i ask is that this is the third battery i've put in the tahoe since 2005 when i bought it. The plugs are located behind the glove box. If I were to guess, I'd think the difference in the draw was due to the security system armed when it was locked. This allows parasitic drain to be measured without opening hoods and doors. A little little one, or a substantial one? Then see what it says with the engine running.
The current now flows through the jumper wire. Here is the procedure I use to isolate a battery drain. Or an electronic component may malfunction and cause a parasitic drain that is larger than normal specification. This will determine if something has been activated during that time frame. If my truck sits for more than a day, the battery will be totally dead.
My truck did the exact same thing. Assuming you have the factory side posts, you could avoid the top of the battery if you want. I noticed the other night when I messed with the interior lights as you described that the headlight switch lamp appears to be slightly lit at all times, even when the interior lights have gone out. And at -19°C 0°F , the standing days are reduced to one-fourth. He was sooo happy because he was fixin to pay for an electronic check to find the reason for his battery drain. Are you sure that your ammeter is correct? I took the battery back 2wice and they said the battery is good and my charging system is also good.
Now I had the same problem on my 01. A module or computer not programmed properly can give false data putting the lights on at the improper times. Now that the problem is fixed, my TrailBlazer draws less than 10 milliamps — after the computers on board shut things down this takes about fifteen seconds or so. I have checked pretty much everything that is aftermarket to make sure it is off when the key is off. Effects of Temperature on a Standing Battery The parasitic drain will be fairly constant over a range of temperatures. If the reading is out of specification, the procedure explains how to pinpoint the cause. Now to figure out why.