2017 2.5i Premium Lapis Blue
Still not Outback related but I think the dead battery problem I was having with my GMC Sierra simply ended up just being a bad battery after all. I was never able to duplicate the 2.5 amp draw that I had but I spent a lot of time testing and retesting and pulling every fuse and relay individually while checking for current drain. I would show close to 200ma for a short time after shutting the key off but it always dropped way down after a few minutes. Along the way I did find a blown fuse for the left trailer light turn signal, which I had no idea had a separate fuse than the truck turn signal. I did pull three fuses for the remote start and the one for the Onstar system which have been known to cause battery drain problems on GMC and Chevy trucks in the past. But even with them in I didn't measure any excessive drain. It is still possible there was an intermittent drain in one or both of those circuits.I'm currently battling a dark current draw on my GMC Sierra pickup so it isn't just an Outback thing. I just recently started driving the truck again after it had been parked for quite a while. I had periodically put a battery maintainer on it while it was sitting, and made sure the battery was fully charged before I put it back on the road. The battery is an Interstate that is about two years old. I drove the truck for about a week and didn't notice any issues. Then I went to use it after it had sat about 24 hours and the battery was dead. I jumped it and drove it to town, leaving it running while I was stopped, and back home. I put my maintainer on it until it was charged again. The next day it was too low to start the truck again.
I decided to test for current draw with everything shut down, though at that time I was actually suspecting I maybe had a bad battery. One of my cheap analog multimeters was handy so I grabbed that, set it at the 500ma setting and checked the current. Promptly either fried the multimeter or most likely blew the internal fuse. Hmmm, maybe there is a current draw issue here. ?
In the second round I found my digital multimeter and found I have a 2.5amp draw with everything shut off. So yeah, 2500ma might have been a little much for the 500ma setting on my analog meter.
I suspect it might be related to the aftermarket remote start but it will take some testing. All I did so far was to pull two inline fuses right at the remote box under the dash but that didn't make any difference in the current draw. I guess the next step is to just start pulling fuses one at a time until I find out what circuit is the culprit. Unfortunately the high temp today is 3F with 10-20mph winds and the truck is sitting outside. I have a snowmobile and a quad in various states of disassembly in my shop so the truck is just going to have to sit for a little while.
Anyway, the battery still didn't seem to be staying fully charged. I finally just decided to try a different battery and after I did I had no more problems. Even after sitting for a week the new battery was still right around 12.6 to 12.7 volts. Meanwhile I charged the old battery (not that old--Interstate MTP48/H6 that I had purchased new just over two years previous). I checked it every day not connected to anything and it showed good voltage for the first three days. Then on about the 4th or 5th day it was suddenly showing 10.6 volts-essentially dead. I charged it again and within two days it was back down in the 10.x range again. I charged it again and brought it to the shop where I had bought it to have it tested. At that time it didn't clearly fail the test but it also didn't react as a good battery normally would either. I left it there so they could charge it again just in case my charger wasn't giving it a full charge. I went back yesterday and he said this time it failed the load test immediately after being charged. I was still within the 30 month replacement so I left with a new battery.
Hopefully that was the problem all along, though I can't explain the huge 2.5 amp draw I measured initially that I could never duplicate again. I still have four fuses left out and I am going to try putting them back in one at a time and continue to monitor the battery voltage to see if it drops after they are reinstalled.