How do you check the rectifigher

 

Rectifier on what year and model?

 

On the regulator - red wire- batt voltage, black wire- continuity to ground. If those are good, test ac voltage.output from stator. Will explain that if need be but I'm on my phone and I'd rather use my shop PC.

 

Stator test needs a DVOM set to AC voltage. Run the unit at idle and the yellow wires are what you need to check(may have red tracers on the wires as well, but there should be 3 of them, didnt look at a manual) Some aftermarket stators use white wires so it depends on whats in the machine.
Run the unit at idle and it should put out ac voltage. Probably in the 15 AC volts should be about where it is at. If it shows 2, stator time, if it show 20, still ok as I personaly believe a stator can not ever in any situation put out more voltage than it did when it was new.
There are Ohm checks for stators but not knowing what machine you have its hard to say, but if its a polaris the charge portion of the stator(yellow wires) is usulay in the 0 to 1 ohm region. That being said, I have seen stators pass the ohm test and fail the AC voltage output test.

 

One way to start eerything is check battery around 12.7 when parked for awhile. Then 14.4 when revved up. Then you need to check AC out of stator. Need specs or how many AC volts per rpm.