Circuit Breaker labeled APS?

Back with an update, was on the boat again today and traced the wires from the CB - that transformer is NOT related to the APS circuit (no light issues either).

Found the attached is in-line - and it looks like the load wire might run up to the panel - that's gonna need to wait for another day.

Haven't had a chance to search the interwebs for this device yet.

CB's are the push button type, 30a on each batt.

To the best of my knowledge, the boat does not have trolling valves. I asked the PO as well as the mechanics who have serviced the boat.

No thruster and the windlass is on a different circuit breaker. Everything seems to be working upstairs...but I can't recall if just one or both of the CB's wouldn't reset. If just one, then I imagine whatever load this is connected to is not getting the benefit of 'either' battery and is tethered to just one.

Heavy loads on the 12v side, hmmmm....I would think the heaviest would be DC pumps (bilge/washdown) or maybe the bridge and all of the electronics. The gauge wire should be easier to find on the panel or bridge, I'll run a continuity test to see if I can find it. And, i'll clean up that crud on the post.

BlueNomad, LMK when you're no longer 'At Sea', I'll send or meet you for that beer

Pretty sure Capt. Ralph is correct, that transformer proved to be a wild goose chase and not part of the APS system - I was guessing. See posts above. At least I learned something new about the boat's system .

Went through the original owners manual, no reference to either. The electrical section is VERY weak, not a single diagram

Back home now and searching the web, seems to be related to a ZF micro commander control. I had ZF controls on a previous boat but don't ever recall seeing a ZF box anywhere on this boat. Throttle controls are Palm Beach style but I guess there still could be a ZF box around somewhere.

I've sent a message to ZF Mathers, hopefully I'll get a response. Also posted on the Egg Harbor FB (don't judge me, might be post #7 on that junk) page.

Back home now and searching the web, seems to be related to a ZF micro commander control. I had ZF controls on a previous boat but don't ever recall seeing a ZF box anywhere. Throttle controls are Palm Beach style but I guess there still could be a ZF box around somewhere.

You misunderstood, the transformer and APS relay are NOT connected in any way - 2 different systems. I 'ass u me d' that the transformer was in-line with the APS CB.

Great diagram, I think there's clearing on the horizon!

My prior boat (an OB express) had a micro commander box similar to the one in your diagram and had 2 stations, helm and tower. In fact, I removed that box and controls when I re-powered the boat (digital controls) but don't remember seeing an APS in-line. Hope the guy I sold it to figured out something was missing, he never came back and asked....

I don't recall seeing a micro commander box on this boat, but in fairness there are a bunch of control boxes in the helm console that I just assumed were related to the CAT engines (I know for a fact several of them are). I'll climb in there and start poking around.

In your diagram, my use of the term CB is in reference to the 30amp fuse between the batteries and the APS. I did not see the 10amp circuit breaker leaving the APS, but it may be closer to where the load wire terminates (thought it should have been closer to the APS though).

This diagram also seems to point to the APS having no bearing on my electronics resetting when the engine starts. Note, I am careful about the start sequence at the dock, but often when out fishing I'll power down the mains while drifting. When it's time to restart I forget about the shutdown.