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Good diagram up there for sure!
Red wire having 4v should be enough... all that does in all the other cases I've seen is "tickle" the solid state regulator, telling it to turn on and let the field winding current flow.
Also, by voltage flow, do you mean there's an actual DROP in voltage on the wire, or did you backprobe on the alt and measure between the red wire and ground?
I assume you mean the second one, where 4V is present at the connector when measured to ground.. in that case it would be good.
If you've got something at red and 12v at red there is no reason the alt shouldn't have 12 (or 14v, w/e if you wanna be techincal) measured at the bolt when it's running, even if the fusible link is shot I'm pretty sure..
something's not adding up.
If it starts, it should be, but is is your engine ground OK?? measure between a bolt on the engine (any one) and the negative battery post... you should see like .02V or something tiny like that.
Hopefully it's just the link though.. ug toughy...
I may be wrong about the turn on wire... it might need 12V, I dunno... I'm gonna ask around the shop tomorrow, maybe someone knows just what voltage is supposed to be.
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