1 wire internal or external oem alternator

jasondrobbins said

I am curious about what everyone’s opinion is about converting to a 1 wire internally regulated alternator

Click to expand...

No advantage, plenty disadvantage—chief among which is if the regulator fails, you don't get to just replace it in five minutes wherever you happen to be with the spare you grabbed out the trunk (or bought wherever). No, you're stuck until you replace the alternator.

There are worthy alternator upgrades over the not-very-efficient '60-'87 Chrysler items. No need to waste money, time, or brainpower on exotic ones; just fetch a stock alternator for an '89 D-150 pickup with 5.2 or 5.9 engine. This one if you want 90 amp, or this one if you want 120 amp. They both come with a suitable 2-groove V-belt pulley. Minor bracket modifications will accommodate it, and it won't even look all that different to original, just smaller.

Regulator: Mopar-type external; this heavy-duty adjustable one.

Much more important are the necessary upgrades to the charging system wiring. See here.