Had a battery in my car and noticed it was being drained, left it on charge many times and ended up buying a brand new Bosch Battery, Now this battery is being drained, Its now on charge, can someone shed any light on what might be causing this issue, Any help appreciated.


Thank You In Advance.

 

Model and year, Jdm or uk?

 

It's 1997 impreza Catalynya 2.0 turbo, uk, hope that helps.

Thanks

 

tracker or alarm back up batteries need replacing.

 

You have a parasitic drain on your battery. Plenty of youtube videos on how to systematically go through your electrical circuits until you find the offending one.
Basically connect an ammeter to your battery IN SERIES and pull fuses until your drain goes away. Then get a wiring diagram and see what's on that circuit and start disconnecting what's supplied by that fuse. Common causes are alarms and radios. Be particularly suspicious of anything aftermarket!

 

Thanks for that guys appreciate it, the chap who I bought the car of said the battery sometimes dies because of the alarm maybe not fitted correctly, so i got a new alarm fitted by a professional thinking that will sort it, so you could be right maybe it's the alarm or the Amp powering the radio, I'll start disconnecting and see if I can locate the issue.

Thank you

 

check boot light switch isn't permanemtly on, open boot if its hot that means its been on a while ! this happened to me 2 batteries later I found out the above.

 

Cheers mate I'll check that now,

 

I had a very similar problem and did all of the above.

For some reason it turned out to be the interior light above the headlights. Despite it being set to only light up when the doors opened it was still draining the battery.
Turned it off which can be a pain in the *** when parking at night but no more issues

 

Cheers guys checked all the above, gonna give it a few days and see if its sorted.

Thanks

 

Hi guys hope all well, The dreaded battery drain is back, Brand New S4 Bosch Battery 3 weeks old is back on charge in the shed, anyone know what's the correct voltage that should show on a multimeter? Mine is showing 10v when off and 11.5v when started? Could it be the alternator that's causing this, checked all the above and everything seems ok.

Would appreciate the advice.

 

11.5v is too low for when the car is running, electrical system is a 12v supply so if your driving around and using say the radio, lights are on and wipers going, the draw is probably greater than what is being replenished. Mine is up around 14. something at the terminals when the car is running so i would look towards alternator is your multimeter is correct.

Just to try, the car should run with the live disconnected from the battery when started with a few things on inside the car. Try disconnecting it once started and see what happens if it dies then it's not doing it's job.

 

I'm pretty sure it's 12v off and 14.5v on.

 

Thanks for everyone's help, turned out to be the Alternator in the End bought a re-con and all is good 14v showing.