Roger - what type of wiring system do you have? If it is already permanently terminated at the fuse block, then you probably should do a full layout before you do the final terminations at the powered device. I'm not real fond of them as sometimes it's a real PITA to make a run with all of those extraneous wires and the fact that sometime it is just plain easier to feed a wire the other direction or change a route. Since my block was behind the seat, it had other considerations, but mostly how to route the wires without being able to see them - I would do it different another time - but, it's done, everything works...... I did one system at a time, checking continuity with each by my powered tester/light. I then after getting a system in, turned on the master switch to check that entire system just to make sure. I used lots of masking tape as Dave S suggested and several hundred cable ties doing, redoing and re-redoing ad nauseum.



One rerouting shown above (i.e. re - re - re - redoing)