Orisisail is spot on. Additionally, your Link 10 monitor
should auto reset the amp-hours count, if it's not accurate, whenever you fully top off your batteries in float mode.
This brings up another point, however. When you're charging your batteries and your charging rate drops from 60 amps to 16amps, that's b/c you've entered acceptance mode. The charge rate will drop even further (a couple of amps) when you enter float mode. So it will take a long time, and you will rack up many engine hours, if you want to fully top off your batteries using only your alternator. If you don't get your genset fixed, you might consider a small solar
panel to fully complete the charging process.
My practice is to shut down the engine as soon as the alternator charge rate drops below about 20 amps (acceptance mode) and let the solar panels
take care of the rest.
Sorry if the above is kind of obvious, but I thought it might help.