I talked to M&H tech support today bassicly asking where the two tie points are on the forward lamp harness.

One goes to the Battery junction point that gets jumpered again at the horn relay.

The other is is suppose to tie at the Alternator.

Seems like the same point to me but he explained how it worked not that it made any sense to me but their should be a small difference of potential to work the gauge.

For me this means I should be able to measure from ground to either the black or white of the Cluster Gauge plug and read 12 Volts. I can also do some continuity checks with the battery disconected. I'm not going to look at it until spring and may end up calling back for more details if needed. If I can I will document the whole thing and possibley make a drawing. My set up is a little different in that I have the internal regulated alternator.