On our company 97 Chavy van with 6.5l engine, the positive battery cable end at the auxiliary battery mounted on the frame rail under the van always corrodes badly. The negative cable end does not corrode. It is not the battery since the corrosion persisted after the battery was replaced. I use dielectric grease on the terminals and the corrosion still takes place. Two questions. What can I do to minimize the corrosion and why is the corrosion confined to the positive terminal. The positive terminal is towards the front of the van, maybe it gets subjected to more splash.