Why does my Subaru Outback battery drain so fast?

Why does my Subaru Outback battery drain so fast?

However, if you disconnect the battery, insert an ammeter and then read the current, it will be high because the systems in the car that are always-on, or in sleep mode, have to start up again. It might take a few minutes for it all to settle down.

How long does a Subaru Outback battery last?

Theoretically, 0.6 A will drain a healthy, fully-charged 48 Ah battery completely in 80 hours, and probably to the point where it won’t start the car in half that time or less, or less than a couple of days. It’s not the battery.

Why does my car battery drain after I Turn Off the key?

2. Parasitic Drain Parasitic drain is due to components in your vehicle continuing to run after the key is turned off. Some parasitic drain is normal – your battery delivers enough energy to keep things, like your clock, radio presets, and security alarm operational at all times.

What happens when I remove the back up Fuse?

I found out that when I remove the BACK UP fuse (7.5A, but there’s a 10A in its place) from the under-hood fuse box, the fluctuating current draw stops and stabilizes at a constant 0.06A. According to my PDF Helms manual, the BACK UP fuse is used for clearing codes of the TCM, the radio code, radio presets and clock.

What does it mean when your battery drains overnight?

Why the Battery Drains Overnight A slow battery drain when everything is off is called a parasitic power loss. This happens when something – a glovebox light, an amplifier, any electrical component – is pulling power from the battery when it shouldn’t.

When to disconnect battery from parasitic drain?

If you’re too busy during the workweek and can’t get to it until you’re off, some short term fixes are to disconnect the battery at night, and carry a portable jump starter in your vehicle.

Why is my alternator draining my car battery?

Since the alternator isn’t generating vehicle electricity, the problem component pulls from the battery, slowly draining it overnight until your vehicle won’t start.

Why does my OnStar battery drain so much?

Community Answer In older vehicles running analog Onstar, the system will drain the battery because it is constantly looking for a signal. Onstar no longer offers an analog signal, only digital.