with the bike switched off, connect the meter across the battery,set the meter to DC Volts should show around 12-13volts.

start the bike up with the meter STILL connected , the voltage on starting will drop to around 10volts , less than 9volts while turning over battery is knackered, (& it wont start )

if it starts while running the volts should rise as you rev the motor, to around 13-14volts
if it doesn't the voltage regulator OR the alternator needs checking as per manual.

hope this helps

Check the connectors behind the front sprocket cover can't remember if its the one between voltage reg and battery or v reg and stator that melts but check both its dead easy and easy fix

Had the same problem,it was the 77 connector ,best junk it and hard wire with inline crimps,done mine no problems since,there is enough cable for a few goes if thr regulator does go at a later time
Pete

V.reg failure is VERY rare on XB's but stator failure is common.

.....tis the other way around with tubers

just to be different ive had a regulater give up the ghost

Back to basics.......with the bike running at 2K rpm and a DC volt meter across the battery, what reading do you get ?....should be 13-15V.

Have you checked VR for bleeds ?.....should be zero
Have you checked stator windings for continuity to earth ?.....should be zero
Have you checked stator winding resistances ?....should be 0.1-0.3 ohms
Have you checked AC output of all 3 phases ?......should be around 35V @ 2K rpm.

Well, although it didn't run as smooth as expected, I got it into parts now and found another proof of Buell's high quality work.

Scattered and sticking to the magnets:
http://ecmspy.com/download/gunter/scheibe.jpg
and here what it did to the stator:
http://ecmspy.com/download/gunter/stator.jpg
and at this point at least one wire is grounded:
http://ecmspy.com/download/gunter/kurzschluss.jpg

As usual - BUELL = crappy production & missing quality control.
I bet this bike had a short circuit with the first turn of the engine.

And I need a new hex nut for the clutch.
Someone who has one in stock?

Compu-Fire replacement parts are quite highly recommended:

http://www.compufire.com/harley-main.html