Hello, having electrical problems with my Eldorado. I cannot keep a battery charged, they keep running dead on me. My alternator tests good and i have a good battery but i can not keep a charge. Guy at Advanced Auto suggested a alternator regulator so i bought one, but i have no idea where it goes. Thanks for anyone who can help me out

I thought those had the internal regulator in the alternator...

Yes, That would have an internal regulator. How ever if the battery is always discharging the diods in the alternator are bad. The alternator will test good for a load. To test the diods the alternator needs to be dissasembled. Replace the alternator