Check the negative or ground cable to be sure BOTH ends are clean and tight.
That is where to start. ANY thing still using power with the keys out, will kill your battery in time. Radios ANY light left on, boosters ETC
If the alternator is good then the battery is bad.
Dead or weak battery? Alternator not charging battery properly?
Defective alternator, loose alternator drive belt, dead cell in battery, or something is on pulling power from the battery.
Generally, yes.
The battery on the Monte Carlo is under the hood. It is under the washer fluid bottle, which has to be removed to reach the battery.
It could indicate poor battery health or a problem with the alternator.
Bad alternator not charging battery? Bad voltage regulator? Blown fusable link?
It's inside the alternator.
It is the alternator. I have a 95 Monte Carlo and this has happened to me twice in the 3 years I've had the car. Each time I had to have the alternator replaced. The first time I had a problem with the alternator I took it to a shop and had it fixed. Two years later the alternator went out again without warning. That time we took it to a different shop and bought a new alternator with a three year warranty so it'll be free if it goes out two years later again.
In engine compartment
sounds like the starter or alternator
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt.