Thanks everyone. FBody69, I tried what you said and sure enough, it stalled after I disconnected the positive cable. I then took the alternator up to the parts store, and it tested fine. So, I bought a new voltage regulator just in case. However, going back to one of my original questions, does the ammeter gauge need to be grounded? The white wire coming off of the gauge is going to the power distribution splice, and the black one is going to the junction block.