Lt.Mike":16o8g7zn said:schumacher battery tester is simple and does what you need it to do.
https://www.amazon.com/Schumacher-BT-10 ... B000AMBOI0
That’s what I use to check the battery itself.
I use a simple digital craftsman multi meter to check battery voltage at rest and with the engine running to verify alternator output.
A good 12v battery should show 12-1/2 volts and alternator output 14-1/2 volts.