[ 2006, 03:12 PM' post='77460'Quite honestly I can't see the need for these things, and I think there are several on the market but the most elegant way to monitor your battery charging is simply to fit an ammeter to the system, when the charge rate drops back close to zero your batteries are fully charged it is as simple as that. But if someone wants another indicator to look at that's ok too, I am a bit that way myself.
That must mean that there is sometihg smart in the alternator that knows (possibly over only 2 wires) what the state of charge of the batteries is.