battery drain

[ty2airborn]

Hey guys im new here i was wondering if anyone has found a fix for he battery drain issue with a 04 silverado 2500. i have pulled every fuse and even the radio and still get 3.2 amps or so draw. im lost at this point becuse i have pulled out evry fuse . what should i do next?

[dewfpo]

Am I reading you correctly? Your saying that you have pulled every single fuse (all at the same time) and were still showing a 3.2 amp draw?

 

DEWFPO

[Formulabruce]

Mine was the timer /key bell circuit, which passes through the stock radio..I ditched my radi for a nice aftermarket plug and play blue tooth

[ty2airborn]

I have tryed to do the parasitic test but. When check all the fuses one buy one the multimeter still reads12.21. I have unplugged the bcm and radio and even the Guage and still read 12.21. I then removed every fuse and the only time it dropped is when I removed the pcm b ,abs,blower,hvac/eca,radio info ,radio amp fuses . What should I do next or do I need a new computer

[Formulabruce]

check your grounds to firewall from engine. Sometimes if there isnt a good ground, the logic lvl voltage may seek a weaker ground and cause some problems. After that, next step is to have the delaer plug in their diagnostic tool that they can eliminate each load and circuit right on the tester, good luck!

[dewfpo]

You check for parasitic load by removing the negative battery cable and connecting a DVOM in series with it so all the current flow passes through the meter. You set it to the correct scale and read the load, then you pull and replace one fuse at a time to see which circuit is pulling the big draw. That's where you start.

 

DEWFPO

[ty2airborn]

Ok guys today I got to work on the truck a bit and found that I'm having draw from my tbc batt , mbec1 ,lbec2 ,info fuse. Anyone know where I can get a wiring diagram for these

[5Alive]

One thing to do to eliminate all of the courtesy lights, retained accessory power, door/key chimes, and other body control module awakenings is to pop your hood release, shut all your doors, and walk away from the truck for at least 30 minutes.

 

But before you walk away, go ahead and set up your (fused) multimeter in series with your battery under the hood, that way when you do return to the truck to conduct your parasitic draw tests, you are not dealing with temporary loads from having shut down all your modules (by disconnecting power) and reawakening all your modules (by hooking up your meter). Glove box shut if you have a glove box light? Doors shut? Meter all set up? Under hood light bulb pulled if you have one? OK, partially close your hood and walk away.

 

Come back to the truck say an hour later, do NOT open any doors, lift your hood, and begin your parasitic draw observations and fuse pulling tests, one at a time, of the underhood fuses only on the first go around. Might as well start with your most culpable suspects that you found with previous testing. 3.2 amps is quite a bit of current, so we really want to rule out doors being open, modules going through a change of power state or boot up sequence, etc.

 

After the more refined results of that test, then your attention can be turned to the middle and left bussed electrical centers. (MBEC and LBEC)

[99chevyfreak]

I have tryed to do the parasitic test but. When check all the fuses one buy one the multimeter still reads12.21. I have unplugged the bcm and radio and even the Guage and still read 12.21. I then removed every fuse and the only time it dropped is when I removed the pcm b ,abs,blower,hvac/eca,radio info ,radio amp fuses . What should I do next or do I need a new computer

Same problem with mine. Did you figure it out ??? Ty2airborn ?

[slj2008]

1. have you check your battery / holding charge with cables off. 2. check battery cables , pos , neg, engine ground /firewall . Any thing plug in to power outlets, Radio system / amps .