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Colt

You blew a fuse in the water makeup box which should be on the ceiling of the bay in front of the plumbing bay.

Mine is about a 16in by 20in box. Looks like an electrical box. Even on your H it should be similar.

Later

bv

[Bernie]

Thanks Bernie

We have been in the box marked “water bay module” and checked all fuses. One of the grey plug- in modules has a red light on. We swapped modules, and swapped module also displays red light. Other than the red light displaying, we cannot find anything that looks suspicious. Still stumped!

[Tim]

Red is no good Colt. When you switched the actuator the new ones have more wires than the old ones.

Did you get it wired correctly?

Later

bv

I just remembered there’s a couple fuses behind the panel that has all your switches on it, also in the bus on your electric panel where you have the 20amp push in breakers there are a couple for waterbay and cord real, check those.

[Dick]

Yes, there is a 5 amp fuse behind the lift up panel in the water bay that feed power to the dump switches and also the hose and cord switches. Lift the panel and you should see a blown fuse (red light) top right hand side if your H3 is wired like my XLII

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Just curious since I’ve recently replaced fuses in my back bedroom, where exactly is the lift up panel in the water bay compartment?

[Ronald]

Tim,

On my Marathon XLII, the panel that has the dump switches and water valves on it hinges from the top. There is a latch hidden behind the center bottom edge of the panel. Your H3 may not be the same?

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Thanks to all for input.

Chuck, I know about the 5amp fuse and it checks good.

Bernie, all circuit breakers in the bedroom panel are good.

Marathon tech support says, based on numeric code on wire that powers switch and prior diagnostics checking out good (e.g., fuses and circuit breakers), likely culprit is “Relay #7.” Tech suggested several possible locations for this relay, but I cannot find it. Unless someone knows the location of the relay, I will call Marathon on Monday to get schematic review.

Thank you again for trying to help out.

[Mike]

Colt,

Where’s your box located in your waterbay? I think Marathon put the box in a different location on H’s vs. XLII’s.

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If you are asking about the panel that houses the water bay modules (and a lot of other stuff), it is in electrical bay. Mine was on back wall behind chair/Littlle Giant storage, and I had no idea it was there until I crawled in the bay.

[Peter]

Colt

On mine the relays are under the bed. All the relays are black in color except the 2 that power the black and grey dump valves, they are clear and marked B and G.

Later

bv

[Walter]

Colt,

The node relay boxes usually have up to 5 circuits (1 for each button on a panel) and each has a fuse. They are easily checked by taking the cover off, but can be a PIA trying to find the location of the box itself. Look in the electrical portion of your manual, the node relay locations are there, but again, a PIA to nail down.

One of my plumbing bay nudes is under the sink floor in the bath.

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Tim

on our vintage of coach, the hinged panel the others above are talking about, it’s the panel the maniblock

k is on. Ours has screws. Theirs have a top hinge to swing up and bottom clip to keep it closed. Nice addition

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Wait…. the driver controls marked “grey and black dump open” are supposed to open the dump valves? I thought they were just indicator lights…. how do you make them work? (I’ve never got the to do anything)

Sorry – I’m no help about the fuse… I haven’t dug around there yet. I do know that tech link relay modules have fuses inside them though…. if that helps.

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Walt,

On mine they just light up to remind you the dumps are open. Cole thinks they’re automatic turd ejection switches.

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Something tells me I’ll be discovering electrical panels/fuses in the years to come…