nbSteven had (yes HAD) a Sterling Marine Power “Universal Advanced Alternator Regulator” (Sterling Universal Advanced Alternator Regulator Manual), The magic box of tricks is supposed to do the following:
Standard engine alternators are not designed to be good battery chargers. The Sterling Universal Advanced Digital Alternator regulator converts any alternator from a constant voltage supply to the latest 4 step, constant current battery charger. This enhances the alternator’s charge rate by at least 400%, it will compensate for voltage drops and charge the batteries much faster and increase the life of the batteries by reducing sulphate damage.
nbSteven’s previous owner said it was a bag of nails (if you can defend the box please feel free). as such, I carefully removed it and the associated wiring from around the engine (read rats nest), however I had a look at the manual for it, and since at the moment I am cleaning up the rats nest of wiring on the engine, the solar controller, battery charging / power circuts in the engine room.
It will not be going back on the engine.