not sure about water proof. But before I'd spend $500 i'd ask our fellow m715er's if they have a line on a good used one. Many folks have put in new engs in there truck and no longer need them. bcw1284 is parting out 2 trucks now he may have one. If your going 12v the one from auto zone should work. Ill be getting one tommorrow. I'll let you know how it works.