The original solenoid is only good for about 10 amps. That car solenoid will do 800 amps. Yup quite a difference. Mind you an MTD and most mowers out there are built cheap. Also MTD makes mowers for most of the expensive competition as well. The expensive people (other than Deere whom really does make their own) will deny it, yet if you ask a mechanic, most of your lawn 4 wheel variety competition will order from a MTD supplier.