Quote:
Originally Posted by 80stech
@OP The AGM batteries are way better at "hanging on" (and seem to not self-discharge at all) if there is a parasitic draw so it would be best to measure the draw to make sure and not assume there isn't one especially if you suspect something is wrong.
If you don't already know, if letting the car sit for any length of time then maybe give the keyfob an extra push on the lock button immediately after the first push, the clown nose should give a long flash indicating the interior sonic sensor is disabled so less drain on the battery if it gets triggered (which you probably wouldn't even know because the alarm horn probably doesn't work!  ) and what ever drain from the sensor it self. |
Just checked the AGM battery again and it's 12.81V. No charge applied since 7/1 (12.75V), so 5 days and the voltage even went up slightly.
I've thought over the years there was a parasitic drain with this car but never tested for it.
Only things I can think of is the alternator isn't consistently charging the battery or maybe a ground strap isn't secure and the battery isn't getting charged properly. Probably 12 or so years ago a tech forgot to reattach the engine to body grounding strap after doing some work and the battery died because it wasn't getting charged. Took it back and they reattached the strap and all was good... or so I thought.
I'll likely change out the alternator next. Any suggestions on what to get?