Quote:
Originally Posted by JERM^
This is why it kind of troubles me. I actually did have a battery replaced sometime early 2016. It is a different battery than the stock BRZ one IIRC than the stock one and supposedly has more cranking power at 750?
I have a feeling it is the alarm system and the keyless entry. From what I understand, the proximity key sensor is always on and when any key (from any car) comes near it draws a bit of charge to read it. When the car is parked inside beside another frequently used car with proximity key, that could be why it drains the battery?
My confusion of posting this, is that the battery seems to always have more than enough juice to power everything else but can't turn the crank... It's almost like the battery needs to be at least 90% full at the time of crank so it reaches the state of "still a lot of juice but just can't start the car" really fast... I find it very hard to accept.
Either way I will try the battery route first.
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This is one of the most commonly stated and misunderstood things I have read on many car forums (and discussed before forums existed).
Your battery can indeed seem to have plenty of power for everything else and not be able to crank the car. All the lights and HU and everything else only draw a couple of amps so they will seem fine. The starter motor needs full amperage to work. When you try to start it and just hear a click that is the solenoid engaging the gear on the starter. There is enough power to push it up but not enough to spin the starter motor. Keep in mind that starter motor is trying to spin all of the internals in the engine from a dead stop. That takes more oomph that turning on the dash lights.
If you have changed the battery then perhaps it just needs a little maintenance. Check the electrolyte levels and make sure they are all up. Pull the cable clamps and make sure they are clean and tight. Even a small bit of corrosion can cause intermittent issues with starting. Have the battery checked for both voltage and amperage before you go changing it again since it could be a charging system issue (I doubt it is but check).