Just had a starter put on the battery is brand new, and when I turned the car on the battery light came on and when I'm driving it tends to come on and off, took it to go get tested and the battery
Charging and and the volts was at 11.25
which the alternator wasn't charging it. So
what do I need to do?
Most probably replace the alternator, you should be reading around 14V with the engine running while probing the battery.
Do not know if your vehicle has this but a lot do alternator fuse may be blown.
Looking for a Used Monte Carlo in your area?
CarGurus has 2,070 nationwide Monte Carlo listings starting at $2,000.
Search Chevrolet Monte Carlo Questions
Chevrolet Monte Carlo Experts