haven't tried that yet

DON'T try it!

 

When checking these types of generator capacitor, i use a known good one in its place. The actual capacitor value must be the same, as a different value changes the generators voltage.

 

Does ALL the values have to be the same , ie : 300 volts Voltage and 13 Ohms ?

 

300V AC 13μF.
It must not be a polarised capacitor.

 

Update , took the Capacitor to a company that repairs generators , they said wasn't worth paying to have it looked at but tested the Capacitor and said it did not need replacing , was working perfectly and within tolerances . Back to the drawing board because i cant think what else it could be and the cost of a step down transformer is out of the question would be a shame to throw the whole thing away as its like new and had such little use .