No panel?
Does your Sirius not have a panel? Mine looks factory. We have added lots of wiring to our boat but still utilizing the original wiring for the cabin lights, stern light, and bow light. Since we have owned it I have redone the mast wiring, replaced/added mast lights (steaming, anchor, deck) and replaced the deck plug that goes to the mast. Also added shore power, depth sounder, and battery charger. I followed Don Casey's advise in his book on sailboat electrics.