I had this same problem too. After studying the wiring diagram, tracing
wire and cleaning the fuse contacts (The top fuse of three runs the dash ,
stoplight and turn signals, heater blower, etc.) I still had an intermittent
problem. I think mine was/is a bad connection where the green wires connect
to the back of the fuse box. Very hard to clean the back side of the fuse
box. I ending up running a parallel power wire with separate fuse from
the white ignition wire to a common point in the system. There's a second
post on the voltage regulator (mounted on the speedo) where the dark green
wire connects to it. That makes a good point of connection. with that the
problem has gone away.
If you run a separate wire make sure that the new wire and the existing wire
are adequate for the current.
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