Hey everyone,
I just Purchased a used 2019 Coolster 150cc 3150dx4.
I noticed it’s not charging the battery. I tested the stator by checking the white and yellow leads coming out of the stator. I have apx 14-15 VAC on each. I then tested at the plug at the rectifier and had no voltage on the yellow and 40 VAC on white. I was like ok maybe there’s something going on in the harness. So I pulled the harness apart and found that the yellow wire is going to the electric choke/enricher as well. When I unplug this I get 14 volts AC at the rectifier on both white and yellow which is what I think I should be getting but I get 1 VDC out of the rectifier so it could be bad. Does anyone know if the enricher is AC or DC. Does anyone know where I can get a wiring diagram?

 

The choke is just an electric heater, i.e, a coil of resistance wire, as it warms up it operates a thermostat, which shuts off an excess fuel jet. The way you test for charging is across the battery. More than about 12.7v and moving with revs, and it is charging. If there is no difference with engine running or stopped, it isn't charging. Fit a new regulator. Not all these small machines have regulators, some just have rectifiers and the output from the alternator is supposed to be so feeble they shouldn't, in theory, overcharge.