Bad Habit: All the above are excellent replies to what you are doing. The only problem you may encounter is with the depth raider and interference. It is recommended that the wiring from the D.R. to power source be run on a dedicated fused line directly to the battery and not to a multiple fuse block as you indicated. I have seen 1st hand that this holds true on several installations I have seen where there have been problems. Just a FYI is all.