My SD alternator had low voltage ie 12v at idle. I installed a diode per these instructions (http://www.detomaso.nu/~thomast/alternator/) & now have slightly over 14V. An engineer friend of mine said that I likely have a diode out in the rectifier & that this addition compensates for that. Pack of 2 diodes were in stock at radio shack for $2.00 & change. Frequently, copying some "web mod" only covers a problem & isn't a long term fix. Any comments?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.