Ok heres the deal, while driving the voltage gauge in the truck will just jump down to about 10 volts from its normal 14 volts. Originaly I though it was happening when the external tranny cooler fan kicked in. Now that I have a tranny temp gauge I know thats not whats happening, and today on my way home it dropped down to 10 and kept falling till about 8 volts. If I stop, turn the truck off and restart it, the voltage goes back up to normal. I'm thinking its a bad voltage regulator. Anyone else go any ideas?