My 84 245 GLT just killed it’s 3rd Sears battery in 2 years. I noticed for a week or two it’s sort of stuttered when starting, like it just barely got enough power to turn the engine over. Then one day I go out and it’s just dead.

AAA and the Sears guys both tested the cars charging system and said it looked fine. The meter in the gauge cluster is reading plenty of juice too. Apparently the last battery developed bad cells, and I’m assuming that’s what happened this time too (same symptoms). But I’m sure I’m not just having bad luck with faulty batteries. Obviously something in the car is killing the batteries. One guy mumbled something about "maybe it’s the diodes" but I don’t know what he’s talking about.

So what does this sound like to you guys? I’d hate to replace the battery only to kill it again in 3 months. I’m thinking either the wiring harness or alternator, what do you guys think?

Thanks!