Ady,
Don't know what else to say.
We have covered everything.
All the information is posted.
There is something you are not confident of.
All I can think of you have not laid out your foundation.
How many poles on your rotor?
How many slots on your stator?
Direction of spin?
Removal of regulator circuitry, was this done correct?
It is so simple, but unless you do it a person may not realize this.
I wound a couple stators and did not have the coils all the way around and it works like some of Kevin Wests early stuff.
Connected coils in funky ways that should not work and always had output.
A person could mess up and have output on these small alternators.
Alternators come with many different coil windings to try to make voltage at lower spin frequencys.
Forget about any of these type windings and stick to the basic coil.
Even if your alternator or motor spins reverse, it should still work.
The voltage will come out.
Maybe you should play with your diode bridge and get that connected right.
To make it real easy forget about a bridge and just install 1 diode per phase and get the positive voltage signal, then mark your + -.
Your alternator may want more magnetic field, crank up the voltage on the rotor. It should be #18 wire or so. You can apply several amperes current to it.