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Perfect!

One quick solution to the fuse placement issue would be to swap the SafetyHub and the positive bus in the diagram. The bilge could run off of the positive bus, and the trim tabs and helm power could then be fused off of the SafetyHub, downstream of the switch. Or, move the Safety Hub to where...

Ahh... I missed that somewhere along the way. So, yes, your trim tab wiring should already have adequate protection. Still, my concern remains valid for the main wire running to the helm. Looking at my diagram, imagine the switch in the 'combine' position (all three switch legs closed). In that...

Adding the fuse in the ACR's ground wire is a good idea, but I don't think that's the cause of the problem. Fuses are for useful protection from faults, but they do nothing to prevent them. But, you just stated something that made me stop and reconsider the ACR as the root cause... Everything...

Excellent. Now that the circuit diagram is drawn up, and everybody's on the same page, we can try to noodle through what might be happening to pop that 30A fuse in the SafetyHub. So far, I don't have a good theory, but I'll sleep on it and maybe something will come to me. (The ACR is certainly...

OK - Here's an updated drawing. I hope it helps clear up how the switch works. (And I added the HPU.) Basically, when you turn the switch to the 'ON' position, both the start and the house circuits close, and both circuits become hot. The house battery connects to the house side, and the...

Sorry this took so long. (Sometimes life overrides good intentions.) But, I'm glad to hear you may have found the problem. Anyway, I did finally get a chance to draw up (what I think is) your wiring schematic. Before I make any comments/statements, let me know if I got everything drawn up...

I've been busy and haven't had time to work my way through the narrative and build a schematic yet... Should be able to get to it tonight. 8)

Thanks for taking the time to write all that up. I'm pretty sure I could follow everything. I'm gonna go make myself a couple of sketches, and stare at 'em for a bit...

Sunbeam, I've been looking at the electrical pictures you have in your album, and I'm thoroughly confused. Lots of questions here... With the possible exception of the ground wire, the ACR should be connected directly to the batteries - and only the batteries. Is your ACR connected to the...

Definitely puzzling... I'm going to have to ponder these last few failures for a bit.

While it's certainly disappointing that the new 12V outlet didn't solve the problem, at least you can now rule it out with a pretty high level of confidence. So, of course, the next step is it to check out the main house feed. Hopefully you won't run out of 'spare' fuses before you get this...

That's a great clarification Bob, and I agree completely. But, I would add one caveat... Regardless of the rated power draw of the attached systems, fuses should always be properly sized to protect the wire - and never, never above that. You can always use a smaller fuse if the system draw is...

It's my understanding that there are other circuits wired directly to Sunbeam's SafetyHub 100 in addition to the main house circuit. So, using only a single breaker at the battery would have meant running those other circuits from the helm, adding additional load to the main 10ga house circuit...

Sunbeam - It sounds like you've got a pretty good handle on your electrical situations at this point. That's good to hear. In regard to upgrading your existing 10ga house feed, AstoriaDave has a good suggestion. There are two basic scenarios to consider. Scenario #1) Remove 10ga wire and...

OK, Sunbeam (and others following this thread)... I've got a correction to make to my earlier posts regarding wire/fuse size amperage limits. (I DID say I was digging those numbers out of my memory... :oops: ) According to this wire/fuse sizing chart available on the BlueSeas website, 10ga wire...

Sorry for the confusion, Sunbeam. Let's see if I can clear things up a bit... Your 30A fuse protects the main wire that runs from the SafetyHub, up to the fuse/distribution block at helm. And, if both legs of that circuit are made up of 10ga wire (both the positive, and the ground wire), the...

Not so. Those circuits are FUSED for 15 and 20 amps. They should never draw anywhere near that much unless there's a problem with those components, which would then blow those fuses before they blow the larger main fuse. However, I do agree that a 30 amp main fuse may be undersized for the...

Regarding the size of the main fuse, it may - or may not - be undersized. Just remember... fuses are there to protect the wire. If needed, electronics or other components will have dedicated fuses in - or very near - the unit itself. As such, trunk and branch circuit fuses should be sized...

Well, if it wasn't the 12V outlet, you'll find out soon enough. :shock: But... since it was the only non-fused load running through the main fuse, I'd bet dollars to doughnuts that it's either a ground fault in that 12V outlet, or the main house feed is shorted to ground. (My money's on the...