[davepl]

I did the same, just one big red wire coming out to my battery from the alternator and I let the LS3 harness operate the charging. Works as expected, and charges well. That was in my Camaro with no factory ammeter-style gauge or shunt (unless the idiot light still has one).

One thing I couldn't figure out was WHERE the LS3 harness does it's "voltage sense" read from. You'd think GM would give you a wire on the bulkhead harness that you'd run to your dash light or somewhere far downstream, but there isn't one that I know of.