I've been reading every post I can find on this topic and have spent a good bit of time pulling fuses! It seems like I've got some twists to my problem that are unique, and I've got some specific wiring questions, so hopefully starting a new post is appropriate.
First, what started it all: the battery goes dead after sitting for 2-3 days. We just got the car about six months ago, so the first time this happened I checked the charging system and replaced the battery. It's doing it again, and obviously this isn't good for the new battery!
So - cleaned electrical connections, charged battery, made sure all interior lights/acc are off, checked all door switches. Found out my old multi-meter (that I bought ten years ago or so) was acting funky, so went and got another one. Disconnected battery cable and placed multi-meter inline with setting at 200mA and got - zero. That's not right. So I put it to the 10A setting and it eventually settled out at .78 amps. Wow. No wonder I'm having trouble, right?
I've gone through the fuse box and pulled EVERYTHING one by one. The problem is intermittent. Sometimes it'll show a drop to .35 or so, but if I recheck it the .78 drain is back. The only thing that's made a solid difference so far is removing the 120amp SBF from the main box under the hood.
I'm trying to figure out where the SBF 120 fits into the wiring, and my Haynes manual is less than clear about it. Unfortunately I don't have access to a factory service manual. I found one for an '06 Impreza online and it looks like it's for the Power Supply Circuit, assuming similar wiring in my car.
Is this correct?
I've disconnected the alternator with no result, and also the headlight relays (shown on the power supply circuit diagram). Will start to trace the wiring further, but wanted to make sure that I'm barking up the right tree here.
Also, isn't .78 a lot of draw? Seems like there should be a really obvious cause here.
Also, that same Impreza diagram shows another SBF 30amp joined into the charging circuit. Anyone know where this is located so I can check it?
Diagram attached. Thanks in advance for any help.