potter2010 Posted November 3, 2013 Share Posted November 3, 2013 I have a 2001 Subaru Legacy L Wagon with an infuriating battery issue. I'm sure more people will immediately say search the board there are lots of other topics relating to this but rest assured I have spent the day searching the board, as well as Google, reading and trying everything I'm able to. However, if I've missed something please feel free to post the link. Here's the background: purchased in the spring of this year with no problems. Since it started to get cold the last couple weeks it has had trouble starting and finally would not start. A couple of times I had gotten it started by shifting into neutral but this may have been a coincidence as it doesn't work anymore and doesn't jive with everything since then. Lights, dash, etc would turn on and were bright but no crank, no start, no click, no nothing. Had the battery tested and it was dead. After a charge it had 10% health and was quickly losing its charge. Bought a brand new battery and the car started instantly and worked great. Within two days I was in the same situation: lights bright but no start. Got the new battery checked and the health was 100% and held a charge. Car started great. Battery died again within two days. Obviously something is draining the battery. When the car is off the drain on the battery is only 0.02 amps, so well within the good range from what I understand. The alternator is kicking out nearly 15v when the car is started and the battery was near 13v when the car was off, following a full charge to the battery. I used the diode check function on my multimetre to check the indirectly test the diodes on the alternator. Long shot I know but I'm grasping at straws. With the main wire to the alternator disconnected, touched my one probe to the bolt where the wire connects and the other touching the casing. In one direction I got an infinite reading and the one direction I got 0.455. I repeated this a few times and got the some readings. I scratched into the metal for both to get a good reading. I'm not sure what the diodes in the alternator are rated for but I thought the readings might be low and if one or more are damaged they could possibly be draining the battery when the car is off even if the alternator is charging while the car is running. I'm read but at wit's end trying to figuire out what is draining the battery. Any help would be great! Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.