Jerry;
        As far as I can tell the blue wire has NO effect on charge
regulation. I verified this on my 86 transporter. FWIW I measured 14.2
volts at the alternator (with or without the blue wire), with fog lights
and maybe fan on. I removed the blue wire before I started the car,which
had been sitting overnight so there was (probably) no residual charge on
the field.
        Looking in Bentley, reference page 97.70 and follow current track
7 to page 97.74 where it leads to K2, Alternator Warning Lite. Also
reference page 27.23 & 27.24 for t/s indicator light for alternator.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 crew cab(Bessie); 85 GL(Elvis)

Manly's Maxim:
Logic is a systematic method of coming to the wrong conclusion with
confidence.

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