My order of preference would be:
(1) Swap your alternator for one around 80A (because of the single
belt) and which has an external field terminal, and run a smart regulator
. There are a few where you just set a switch for your battery
type. This has the advantage of setting off with a new alternator, and having a spare to boot. If your existing alternator has a field terminal, you can just add the regulator
, easy, and effective (otherwise some soldering is involved, and it's not pretty).
(2) The alt-to-batt works well, and also has a separate feed to isolate the start battery
. Easiest solution, as the OP mentions, and not too expensive.
Solar's great, but if you don't have room to keep them out of harm's way, or if the weather
sucks, it's nice to still be able to charge. Redundancy rules!