ok guys back with another update
test#1 taking the positive screw off and checking amperage between green wire and holding screw.
Answer 0 amps
test #2 measure from battery negative to loose unscrewed positive brush
Answer dropped 2 volts from battery volts
test#3 connected from positive battery to black wire on brush
Answer 0 volts
Test #4 connect leads across brushes
answer i got .3 ohms
test #5 connecting a tail light from positive battery to green brush
answer im getting a very dim bulb
OK,..
Here is what I'm seeing. (Others feel free to chime in case I'm missing something.
#1 By putting the amp meter in series you should have seen current (
with the switch on) You note no amps. Means an open circuit somewhere.
#2 you note "dropped 2 volts." Are you saying the green wire only had around 10 volts on it or 2 volts? Bottom line... with the green wire disconnected you should have right at the battery's voltage between it and the battery negative. Need to take a close look at the voltage regulator plug for corrosion, bad connection.
#3 Something here is definitely wrong. The black wire should be at frame ground (unless the regulator is unplugged or not grounded therefore you should have read exactly the batteries voltage.
PLUS the black brush holder is supposed to have a ground strap that screws to the stator so it STILL should be grounded. This doesn't make sense.
DO THIS: Measure voltage from the battery hot post to the engine. It should be the same as fron the hot to neg. post. If not check your battery's ground cable connection.
Aside from this if you measure resistance on low ohms from the brush with the black wire to frame you should see right at zero ohms, NOT infinity.
#4 The .3 ohms is not good, indicates a shorted rotor. However when you read the resistance make sure your meter is set to its lowest ohm scale setting. (If you know this OK, some folks don't know to do this. Just making sure.)
#5 This test only applies to the stock solid state SVRs. Was from my first post before I found out you have the Mikes XS SVR
Recapping:
If you put your meter across the rotor's brushes with the green wire disconnected and still get < 4 ohm the rotor's got issues or something in the brush assembly is not right.
From your post it seems there is a wiring problem possibly with the voltage regulator.
Check these and the others noted above and let us know.
Ken