Hey, > How to test the card battery when is dead? The last > time I tested the dead battery, the pd. was 12v > ish...... The voltage rating for the car battery. Use > an ammeter?..... Any clues? One of the best ways other than just charging and trying it out in the car is to: put it on the charger anyhow, but make sure the charger has a amp guage, so you can see how much current the battery is pulling. If it doesn't start the car or even sounds like its not trying at all, the charge guage(ammeter) on the charger should read close to full scale, and should stay at near full charge rate for at least 2 hours. If the rate drops significantly within say between a half hour and somewhere up to an hour and a half, go get a new battery. If not, leave it on charge overnight and then plop it in after and try it out, and you'll find out how soon it will die again if at all. One other thing is to make sure the alternator is good too. (usually idiot lights take care of that, but not always [like on my plym horizon]) If you have a battery guage in the car, you should be able to watch it not drop while you drive down the highway (or leave it running for that matter, with the lights on after its been on for 15 minutes). > Thanks, > John No problem -- andrew -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist