Well, I would start looking for plugs that dont have wires.. like when I first got my swap the thermostat housing temp for the engine fan was broken, so I jerry-rigged a wire between the two, and now when the engine starts, the fan does too, no problems.
But however, eveyrtime anyone sees the wire hanging there they are like "Wtf is that?"
With the alternators, I would take them to a car place (pepboys, kragen, autozone , whatever.) and have them test them.. Who knows, two broken parts CAN happend, and have
Also, are you sure the belt tension on the alternator is correct? This reminds me that Ineed to replace my alternator belt.. its starting to fray