WTF is this? - Page 3 - SailNet Community
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post #21 of 55 Old 09-30-2013
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Re: WTF is this?

You have a red button? Cool!

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post #22 of 55 Old 09-30-2013 Thread Starter
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Re: WTF is this?

Quote:
Originally Posted by ottos View Post
I thought it looked home brewed....could be just about anything. What is behind the plywood panel that it is mounted to? There could be wires running through the base to whatever is there.


Pull the cover off!

The box is completely hidden unless you are on your knees in front of the head looking up. No wires come through the surface that it is mounted on. heading to the boat now, I'll photograph and update in a few hours...Stay tuned!
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post #23 of 55 Old 09-30-2013
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Re: WTF is this?

"PRESS TO TEST" "RELEASE TO DETONATE" box?

Perhaps a place to connect a dataloger to the echo sounder?

WE MAY NEVER KNOW!

Have FUN!
O'
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post #24 of 55 Old 09-30-2013
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Re: WTF is this?

You can't leave us hangin' like this!!!

- Jim
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post #25 of 55 Old 09-30-2013
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Re: WTF is this?

Ahhh, it's a warning signal, press it when you've done a No2 to alert passing traffic to a hazard to navigation.
It's also huuuuuuge, I had to scroll to get from end to end to see the whole picture.

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post #26 of 55 Old 09-30-2013 Thread Starter
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Re: WTF is this?

Okay, I think I've solved the mystery. Remember that I was going on the PO's assertion that the head was overboard dump only? Not so fast! This pic is of the fuse that was screwed in to the box:
http://imageshack.com/a/img13/7424/0m2y.jpg

This is the box disconnected from the bulkhead:
http://imageshack.com/a/img593/2353/d14s.jpg

The opened box. The silver knob is a rheostat. The plastic is a folded up sandwich bag underneath a small speaker:
http://imageshack.com/a/img194/4069/c7yh.jpg

Continued...
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post #27 of 55 Old 10-01-2013 Thread Starter
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Re: WTF is this?

The single wire runs through the bulkhead and UNDER the water tank, which is mounted semi-permanently with a 1X3 wooden frame:
http://imageshack.com/a/img818/2434/86l0.jpg

There's not much room but I managed to wedge my hand down between the hull and the tank to...wait for it...knock on another hidden tank underneath the water tank! In the above picture you can see two hoses at the bottom of the frame coming up from underneath the water tank. These two connect as one and run aft all the way to the transom where it exhausts out a small clam shell vent.

Now, taking another look at the hoses attached to the head we see a third hose (the one in the middle) that runs along the sole through a hole in the bulkhead where it disappears under the water tank:
http://imageshack.com/a/img41/4538/0tjd.jpg

Continued...
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post #28 of 55 Old 10-01-2013 Thread Starter
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Re: WTF is this?

We can see that the three way valve would allow waste to be immediately dumped overboard or diverted in to the hidden holding tank. There is no deck pump-out, so I assume that the tank was emptied overboard when offshore. Hence the black box, which is, as some suspected, a holding tank alarm. When it went off the owner probably hove-to and manually pumped the waste overboard. Either way, removing this ancient artifact is going to be a lot more work than I first assumed....it's a boat, go figure...
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post #29 of 55 Old 10-01-2013 Thread Starter
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Re: WTF is this?

Quote:
Originally Posted by PaulinVictoria View Post
It's also huuuuuuge, I had to scroll to get from end to end to see the whole picture.
Yeah, I edited the post so you are not subjected to that big a picture, sorry about that!
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post #30 of 55 Old 10-01-2013
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Re: WTF is this?

OK the large component is a piezo buzzer - I think it is - (PKB6-5A0)

Is there a connection from the other side of the rheostat? I can't see one. There is also a small Motorolla component which I can't identify.

Anyway FWIW - holding tank alarm seems very likely based on your observations of where the wire goes. The button is probably a temporary reset of the alarm.

Take a close look at the red wire from the rheostat. It appears very close to shorting out against the fuse terminal...
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