90profx

Currently cleaning up most of the electricals, but I'm trying to figure out the power IN/OUT on the under seat fuse panel. I'm replacing the old glass tube fuse panel with new a new LED ATM FUSE Panel. Labels on old panel indicate output power to:

MERCATHODE
RADIO MEMORY
RADIO/IGNITION
ACCESSORY
SPARE

So my question is what's the purpose of the power split (radio memory is obvious)?
And what powers up what with key on and what's constant power.

It "appears" the the split power is "Constant On & Ign Key On" related (but not sure).

Thank you.

Revelocity

In general the ignition switch controls the standard Merc engine wire harness connections opposed to non-engine related but perhaps radio also in your case. The remainder should run through the battery switch or be unswitched/connected to battery power such as bilge switch (double check this as I found issues on my 320 and 390), Mercathode, high water level or gas fume alarms if equipped.

90profx

Thanks for the info, I'll revisit this next week and lay out a sketch of the split based on my understanding of your explaination, I'm not familiar with the Mercathode system (but learning), this is a system that should be powered 100% of the time ????
Thanks again.

class6

All you mentioned should be HOT from the battery disconnect switch, then all others hot to dash panel -breakers hot to switches for control. bilge should have a away/off/on switch.. Just check your draw before leaving your boat for too long, I can disconnect my battery switch and still have power to bilge. Its different setup for fresh and salt with Mercathode, Fresh you can disconnect if you have fresh water zinc's in place. Fresh and Salt zinc's are different

Revelocity

If you are keeping your boat in a salt water slip, you want the mercathode powered all the time to mitigate drive corrosion (and bilge switch when ever in the water). It's good to be able to shut off all else (lights/radios etc) with a main switch so as not to discharge battery.

90profx

Usage is fresh water only and slip time would be maybe over a weekend now and then. So after some though as to what to do, I've opt'd to rewire controlling things as follows through a Blue Sea 5511e battery switch:

Starter Battery (1x): Mercathoid, Ignition/Merc Harness

House Batteries (2x): Everything else, Hatch Lift, Radio, Amps's, Blower, Lighting etc, etc.

I have 2 Bilge Pumps in the boat, 1 is switchable at the helm and the other is direct (fused) wired to the house batteries via an automatic electronic water sensor (precautionary). Opinions welcome.......thanks