1992 old scooter 2t, voltage regulator adapting

[davidut5]

So the scooter is very old, no parts available and the regulator decides to short out. Got another 4 wire from a gy6 they say. Wired up but no dc out.
The scooter has 13v ac idle on a yellow wire to the frame/black, black and red is power to consumers and another brown no idea what is for.
Please help me get this thing on the road for my uncle.
Thank you.

[davidut5]

The scooter has all power on dc i think(horn and rear lights at least), so this relay i got does not output enough to power that, and does not work without a battery, the output is too low 5-6v. The ac is regulated by pulling ac to ground about 18v in 13.5v out. The regulation is half bridge also.
I think i need a different regulator that works without a battery and has enough power on dc for all system.

[190mech]

What kind of scoot is it? Any wiring diagrams to be had? Lots of those 4 prong regs are wired differently..

[davidut5]

It is a malaguti dribbling 2 49cc i think from 1992, im helping my uncle with it.
The engine runs without the regulator, magneto has 3 wires coming out, one yellow.
Put the black regulator but all consumers i connected to regulated ac. The old reg had flasher built in, the brown wire was signal lights. Red was rear light and horn, this is ac i think. The horn do not work on dc.
The yellow is connected to headlight, and to magneto coil.
The black regulator does not output enough dc voltage without a battery, just 5-6v. Scooter has no battery.
If i use another regulator, i need both ends of the magneto coil connected, because now one end is grounded. Am i correct?
The lights flicker as the regulator pulls voltage to ground, and signal lights stay on, well they flicker like the rest of the lights. I have above 12v with some throttle all lights on.