Hi, everyone. 

I have a .02 amp leak to ground somewhere in my cabin light wiring so I am replacing all the wiring and upgrading to all LED lights as well.

Looking at how Catalina originally wired the cabin lights (I assume it was Catalina and not a PO), it looks like they were all wired in parallel, sort of like Christmas lights (and thankfully NOT the kind in Chevy Chase's Christmas Vacation movie :-))  They were also wrapped with electrical tape and automotive-type connectors, so I'm not at all happy with the installation in any case. 

However, keeping this as two main parallel wires (pos and neg) this means that I would have to form several T-connection joints, one out to each light, which is not very reliable since apparently no connection manufacture even makes waterproof T-connections joints for 16AWG wire.

Also, I'm wondering if this would even be ABYC-compliant.  Wouldn't ABYC require me to run a positive and negative wire to each light individually?  Although it would be a LOT more wire, it would certainly be safer since (a) I can heat-shrink and waterproof all connections and (b) there would have fewer (by 1/2) connections to corrode and fail.

I'm thinking I would need two busses at the distribution panel, one for the positive set of wires and one for the negative set of wires.  One wire from the positive bus would go to the positive side of the current Cabin Lights circuit breaker.  One wire from the negative bus would go to the negative side of the distribution panel.

Anyone know how this should correctly be done?