bad car battery?

[Eli]

Originally posted by: Sniper82
the ticking/pecking is the engine not the A/C in my situation. It completely goes away and sounds fine with A/C off. But maybe thats normal on a car that has 120k miles with the A/C on.

If the noise goes away with the A/C off, it's not the engine. 🙂

 

[Sniper82]

Originally posted by: Eli

Originally posted by: Sniper82
the ticking/pecking is the engine not the A/C in my situation. It completely goes away and sounds fine with A/C off. But maybe thats normal on a car that has 120k miles with the A/C on.

If the noise goes away with the A/C off, it's not the engine. 🙂

I guess you had to be there 😀. Anyway I used my tester again but instead of going with the percentage/light mode I went by the voltage and here is what I got.

With car off Battery(new) showed 12.8v

Car on and nothing else alternator showed 13.9v at idle

Car on with A/C,headlights and radio 13.5v to 13.8v at idle(kept a constant 13.7v when revved at a bit higher RPM)

Car on with everything on including hazard lights it dropped to 12.5v/12.8v at idle but when revved up to a higher RPM is jumps back to 13.6v/13.6v

How are those readings?

I think the percentage mode on my tested is rated for 14v+ if anything drops below that at all the percentage drops allot. I was getting 0 to 12 percent with everything on.