Battery Light Is Coming On at Idle, Goes Off When Engine Is Revved Up

Write on your battery, your numbers,every once in a while doing maintenance you can just give it a quick check over.Example,different situation, last spring I bought new lawn tractor.I wrote on battery voltage,and while running.Few years down the road I will have some ideas.Things old farts do
Thanks, that's a great tip.
I am definitely knocking at the "OLD FARTS" door. :cautious: