George,

Do the OIL and GEN lights come on with the key?

At the starter, the white/red wire is coming from the 50 terminal on the keyswitch; it should be hot in START. The brown wire is coming from a 35A fuse (it isn't fused though). At the fuse it is ganged with two more brown wires, one goes to the clock and the other is connected to B+ on the regulator. There should be 2 brown wires on B+ at the regulator, the other one comes from the 30 terminal of the stater. Also at the 30 terminal of the starter you should have the big red wire from the battery.

I don't understand why the one wire was taped up. If it was hot at all times it must be coming directly from the battery and should be connected to the 30 terminal. Was there a new heavy cable installed? If so, why was that one left there?

You mentioned a brown/green wire. That is the field terminal wire and should be connected between the regulator and the generator F terminals. And, of course, D- to D- and to the GEN light.

If the starter big terminal is hot, you should be able to get the starter to turn by shorting across from the 50 terminal (white/red) to the big lug.

Do you have need a wiring diagram? www.volvo1800pictures.com/
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Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 53 year old fat man. ;-)