Battery was dead, I replaced now won't boot Error 43

[Electric Peak]

So that I could replace some swollen caps and I removed my motherboard. I marked everything except a small 5 pin connector near the rear of the CPU right next to the keyboard socket (the one that looks like a MIDI port). The connector is black, 5/8" x 1/8". Does it go on the left or right of the keyboard socket (the one that looks like a MIDI port)? Looking with the HD close to me and the back of the unit away from me. Thanks, Fred