Help! - Losing my mind trying to sort out which of the seemingly hundreds of reasons my 2008 Chevy Suburban (110K miles) has crazy battery drain.
Issue earlier this summer traced to air suspension controller and pump - replaced and seemed OK until last three weeks - then, started draining batt every three days - now it drains it in 10 MIN! Battery as new in February and still passes load check. I can use a volt meter to check - but lots of choices. I see on some sites that Instrument Panel is possible. if I'm draining a battery in 10 minutes, shouldn't I smell something hot? Thanks for any guidance! Love your work!
Sounds like your air suspension controller was wired by some guy from England!!
I wish - then I could at least look for some warm beer somewhere! ---| thanks for the pointer on the video - looks like I need to find a resistor (makes sense) to build a test circuit
Look up Scotty's video on parasitic drain, and how to find and fix it.
UPDATED - Followed the Scotty video and made a test lead with resistance. IF I keep the battery on charger for the first hour, it can survive the 3.9 AMP draw and makes it until system starts to goes to sleep. I pull charger off after 60 min and then measure a .20 AMP constant draw with a clamp on meter ofer the test lead I attached.. Went through the three fuse panels pulling one fuse at a time...no change in constant .2 AMP draw. Then I went the route of checking voltage across the fuses and basically found nothing consistent. THe AUX Power sometimes shows a .079 VDC value - maybe it's cycling and I'm just catching it on and off. Also .030 VDC on RR HVAC but not consistent either.
I'm starting to think that while .20 AMP constant draw is too high - the first issue is that 3.9AMP draw when the IGN is off, but the system isn't asleep. No lights are on - no blower noise - some intermittent NAV buzzing, but that stops in 45 sec - and from what I've read on line, thats normal. Any other thoughts on where to search? is that 3.9AMP draw OK for 2007/2008 Chevy/GMC trucks???