The wires going between the amp and the light board only number 5. 2 from the transformer for 6 VAC feed to pads 14, 15. I wre from the left output on the backplane to pads 16. i wire from the right output on the right backplane to pad 1. And lastly one wire from pad4-5 to the star ground.
Perry the 6VAC feed comes from the barrier strip that mounts on the transformer side chassis wall. These may have been clipped off. Look for remnants of the original wires, there may be evidence of these still there.