I got stuck again with a dead battery. Had alternator (3rd x) and battery replaced a month ago. When the gauge is hooked up at the battery, it shows not getting a charge. After reading some posts here , I wondered if the voltage regulator could be the problem. Where would this be located?
I would like to see if there is voltage going into and out of the regulator.

I have a 1984 Mercedes 300 SD Turbo.