The OEM alternator on my '90 K5 finally gave out (thanks to some help from a little mud). After removing the part I found it is the old 12SI style (2 wire plug on back and V-belt pulley) rate at 66 amps, so apparently the 6.2 diesel engines continued to use this style after rest of the trucks went with the CS style. I've owned this truck since '94 when it only had around 40k on the odo and was completely stock, so I'm pretty sure this alternator is original. Well anyway, a winch is coming this springs so I would like to upgrade from the puny 66 amp. I checked with the normal parts store and biggest common replacement they offer is only 78 amps and I wanted something at least around 100 amps, or higher. With big dual batteries and just occasional winching, I figured 100 amp would be okay. Here are the options I've found so far: - buy a specially rebuilt 12SI in 100 amp or more - adapt to the new CS style alternator (means buying a inexpensive wiring adaptor and possibly minor mods to the bracket) - install a 1-wire (self-exciting) style alternator It looks like any of these options could be done for about the same cost. Any suggestions or comments?????