Hello, I recently purchased a 1984 Monte Carlo SS and I'm having a battery drain issue. The original 305 was replaced with a 350. I've narrowed the issue down to the 2 wires connected to the alternator. One wire is a heavy gauge that goes to the battery, the other is a small gauge that goes into a wire harness but I'm not sure where it goes. When I disconnected them my test light went on then dimmed out within a few seconds. If I connect one wire at a time the test light won't come on. The test light only comes on when both wires are connected at the same time. Any help would be much appreciated