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BATTERY DRAIN ON 1989 944

Jinxy

New member
Any advice greatly needed please. Ive had my battery checked & my alternator, both are brand new & fine, however my battery power last a little over a day of no use before I need to use my jump pack on it, the only things I have in the car non standard are an Alpine active sub woofer behind the driver seat which has both a switched live & a permanent live ( no idea why ?) and an ipod which is connected via the USB port on the stereo unit, this doesn't charge until the radio is live. The boot light goes out when I close the hatch, so its not that & the interior light goes out when I shut the doors, so its not that. I know that the flashing LED's on the door pins draw some current, but surely not this much ?? & I know that these cars don't like to sit around for long before the battery goes flat, but ive had more than a day or so out of the battery in the past. its slowly driving me mad, so advice greatly appreciated, cheers, Tony
 
Check the light in the glovebox first, especially if you have lots of stuff in there! It's possible to latch the lid but if the box is very full the lid twists a bit and doesn't open the lightswitch. I had to go through the process of amp testing all the circuits from the fusebox one by one before i found this out on mine. (Note also, that if the glovebox light is on, the alarm won't set properly and the flashing LEDs in the doors will not behave normally.)
To test all your circuits, if you have a multimeter, get a set of these leads.
Hope this helps
 
I agree with Steve that you'll probably have to isolate the circuit and go from there. My 1991 S2 will sit for 2-3 weeks with no noticeable drain (meaning the car starts ok) although I put it on a tender for longer periods.
It appears that my 2014 cell phone however will consume my data plan if I leave it on the alarm clock screen as its trying to retrieve weather information that is mysteriously not available...who says newer is better ....
 
You can by a device that plugs into a fuse holder and also alows you to reconnect the fuse and monitor current draw on a multimeter. This should identify which circuit is drawing current after the ignition is switched off.
 

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