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  #11  
Old 03-30-2012
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Re: Electrical Mystery. Need help.

Is there an automated charging relay or other ghost charger that might be kicking on or off depending on what's happening on another bank?

Are you always doing something else first (e.g. blower taking marginal battery voltage way down, then voltage making it back to high enough for the instruments after some recovery time)?
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Old 03-30-2012
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Re: Electrical Mystery. Need help.

I'm no expert, but have you considered it could be electronic, rather than electrical? Are the data instruments networked? If so, have you tried isolating them?
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Old 03-30-2012
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Re: Electrical Mystery. Need help.

Can you get a voltmeter on the power terminals of the units? If 12 vDC shows up with a switch-on state immediately then I'd suppose the issue is internal to the RM units themselves.

But the fact that you're having issues with other ccts points elsewhere..
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Old 03-30-2012
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Re: Electrical Mystery. Need help.

[QUOTE=AdamLein;852687]I think he means "I will check all parts of the wire" rather than "I will measure the length and see if the resulting number indicates a problem."QUOTE]

Yeah, that.

We'll see what we get from it. It is a complete mystery, and the best I can tell, they all seem to come on about the same time. The breaker panel looks clean, and nothing jumped out at me as far as corrosion. This is the one gremlin I am trying to track down on a boat I just contracted on. I am having it surveyed on Friday but I'd love to have an idea of what I am working with my then.

Thanks to all for the suggestions.
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Old 03-31-2012
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Re: Electrical Mystery. Need help.

Point it out to the surveyor - and use it as ammunition for a discount.
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Old 03-31-2012
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Re: Electrical Mystery. Need help.

I'm told it has done that since the soon to be PO bought the boat. Someone made mention of a possible instrumentation issue. They are all networked on Seatalk so that might have something to do with it. Going to be very interesting to see what it is. I'll let you guys know what comes of it.
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Old 03-31-2012
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Re: Electrical Mystery. Need help.

"since the PO bought the boat"

I'd agree with checking the wiring first. Check battery voltage, and using a known good voltmeter, compare that battery voltage to the voltage available AT each instrument and at the breaker panel.

I suspect that you are going to find the voltage is OK, even if the wiring could use some cleanup. And what this is going to be, is a bad capacitor IN one of the instruments, that is leaky and "eating" the initial charge from the circuit, so that instead of that capacitor charging up in a second or less, it is taking ten seconds to charge up and actiung something like a dead short, pulling the voltage down to nothing, until it has charged up.

The way to confirm that is to disconnect half the instruments, power up, see if the rest come up normally. If they don't come up normally, disconnect half of what's left, see what comes up normally. Repeat and swap (these on, those off, vice versa) until you pinpoint the one bad instrument.

You could do that one at a time--but cutting things in half usually makes the process faster overall. Either way works.

If you DO find that disconnecting one particular instrument solves the problem, either send that one out for repair, or open it up and look for an electrolytic capacitor that is swollen or leaking. That's often a simple eyeball job.

Seatalk: You know the best thing about cheap cellphones? You can call Rayma-whoits tech support, right from the boat, and run some ideas past them. They may have some specific ideas, having met this exact problem before.
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Old 03-31-2012
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Re: Electrical Mystery. Need help.

I would take the positives for the instruments off of the panel and connect them to the battery positive and see if it makes a difference.
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