I finally got around to doing this today and ran into an issue. Drago said
The alternator excite wire runs right there below access panel ( white with red tracer)
When I took off the panel I found these two wire bundles:
The upper one (plug inline) has two white w/ red tracer wires. One looks to be a thicker gauge than the other. Additionally to further confuse things another wire in that bundle is red with a white tracer. I didn't see a while/red wire in the other bundle. So... which one of these is the right one to splice into?