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i just skimmed your message, dont expect many people to be able to provide advice on this since most 240 owners are tools who pay shops to do their conversions. there's only a handfull of people (ie: russ, estevan, and maybe me if i wasnt such an idiot) who know the ins and outs of the wiring by heart.
that lower harness is the one that should handle the reverse lamp switch, speed sensor and other stuff on the transmission. those wires eventually end up inside the cabin of the car. the alternator warning lamp may also go through that harness.
anyway, there's really only a few things that you'll need to focus on.
1) make sure your battery ground strap is bolted on well to the car, and that the cable is good. check your grounds, they are equally as important as your posative leads.
2) the alternator basically has 2 wires. the main power lead which charges the batter. the second important wire is the alternator sensing wire, which senses battery voltage. the alternator creates power based on the reading it gets from the battery voltage.
the red/white wire is simply an alternator failure lead. i believe it grounds out when the alternator begins to fail. the ground signal will cause the indicator to illuminate on your dash. this is not needed and the alt will operate without that wire, its only for your convenience.
mike
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