i am having some charging issues w/ my gti. basically if its not doing 3k or more its not charging. I have grounded the alternator to the engine and the engine to the battery w/ 6 ga wire w/ crimp terminals. I am making good contact with everything. I cleaned the alternator plug w/ deoxit and a brass brush so there is no corrosion on it. I am getting battery voltage at the 2 bigger terminals, and only 10.4 ish on the b+ terminal. I tried to get the cluster out to clean any corrosion, but i couldn't get my arm up there to unscrew the speedo cable from behind the cluster. My alternator belt is good and tight. I'm running out of ideas unless 10.4v isn't enough to excite the alternator, or the alternator is bad, or the battery is bad. Any thoughts?