Originally Posted by Ray S
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Check the FSM diagram I posted, my issue was a less than perfect ground from the reg case to the alt case (it is a single continuous wire) and the electronic reg is very sensitive apparently.
New reg and rebuilt alt, but put out 16V at speed!
I cleaned all and put the brown wire directly on the reg case as shown and peak V dropped to 14.9 at 4,000


14.9 is still too high IMO, 13.8 to 14.2 is considered ideal for a lead acid battery. One can fudge a bit but anything over 14.5 indicates a problem and can lead to shortening the life of components beer

Nice Diagram by the way up