Without removing the flywheel and looking at your magnets there is no way of knowing which amp you have as far as output. But the most common are the 9 amp one input wire and the 10 amp two input wire regulatored systems. The difference in the 5 or 9 amp system and the 10 or 16 amp is the flywheel So I would guess you have the 9 amp system which will be sufficient for your mower.