If you've already found the wires are broken, like ours were, you'll likely find what's left isn't splice-able...if that's a word... In our case corrosion got into the metal of the wires and the insulation was brittle anyhow. Think some here have spliced a new set of "pucks" to existing good wire from bad pucks, though. If I had to rate this repair short of a full replacement, I'd say the chances of successfully cleaning non-working pucks are way better than splicing wires that have already failed due to age and weather. But...
Your mileage may vary,
And this is another reason to store the boat with the drive down if at all possible. Helps shield the boots and wires from the elements.
But stay tuned, I think somebody here has managed to change the whole kit with the bellhousing in place.