Anyone here ever used a Delco 10 SI alternator plug with a diode on your old truck alternator conversion? I am having a battery drain overnight and have narrowed it down to the spade plug on the alternator. When I unplugged from the spade terminal the battery held a complete charge overnight. Gone thru 4 alternators in the last year. First three were bad not charging , the present charging but battery drains overnight. have just replace d the bearing in my old one.