Twenty Rows' 2012 Cabernet Sauvignon was harvested in mid-to-late October from appelations across Napa Valley including Mt. Veeder, Coombsville, and Oak Knoll. The Cabernet Sauvignon fruit also includes 4% Petite Verdot, 4% Cabernet Franc, and 2% Malbec.
Zener diode is a diode which is used in its break down region. The diode is kept reverse biased in a circuit, and so it does not allow current to pass until the voltage is greater than the breakdown voltage of the zener.
Another idea is to bolt the mosfet to a piece of metal to cool it down instead of wrapping it in an insulator to keep it hot. And, finally, you can keep the zener diode in to protect the mosfet, but I don't think the inductive kick is going to jack the battery voltage up above the 24 volts required to destroy the mosfet.