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Help - wiring

Old 04-25-2008, 06:34 PM
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Default Help - wiring

I just finished redoing some of the wiring on my boat. Installed inverter, ACR, and moved some of the wires off of the batteries to battery posts. Finished everything and got mixed results. It seems like I must have crossed something. I only get 5-6 volts at my panel (house). I'm fine at the battery. I disconnected the ACR and still a bit screwy. It's dark - gonna try a few things in the AM. Any suggestions on where to start??
Old 04-25-2008, 07:08 PM
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Default RE: Help - wiring

bigsky - 4/25/2008 9:34 PM

I only get 5-6 volts at my panel (house). I'm fine at the battery. I disconnected the ACR and still a bit screwy. It's dark - gonna try a few things in the AM. Any suggestions on where to start??
Umm, yeah, that would be the first suggestion -- wait til it's light.

Seriously, some things to try before you move a bunch more wires. Do the things hooked up to the panel work? Any of the things? (Brief tries at 5 volts won't hurt any of them, except maybe radar if you've got it. Don't try the radar.)

I am assuming they will not work. (Well, conventional lamps will work, but be dim.) Obviously, you know the battery is at around 12 volts, right? Did you fuse the line from the battery or ACR to the panel? Reason I ask, if something is pulling that line down from 12 volts to 5, it's sort of hard to see why it wouldn't blow that fuse, if it's shorted or leaking to ground. Do you also get low voltage (5 or whatever) at the OTHER end of the wire to the panel, at its first connection? (At the ACR, other battery switch, or wherever?) If it's low at the back end too, I would disconnect it there. If the source to it is still low, then I'd look at the ACR and any other switches, fuses, etc., which you have at the back end.

Might also try removing the inverter input leads, or if it's fused pulling its fuse, see if that helps. The inverter is the one thing I see which, at first glance, could be causing that type of voltage drop on up the line, but not involve a short or ground which should blow a fuse.

Some of this info will help you, and may help the forum figure out what's going on. That kind of voltage difference, on a small boat, when nothing is smoking or red hot and no fuses are blowing, is pretty unusual.
Old 04-25-2008, 09:13 PM
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Default Re: Help - wiring

I am thinking maybe the green ground from the back of the inverter that I wired to a post in the transom that has negative battery wires coming out of?????
Old 04-26-2008, 12:48 AM
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Default Re: Help - wiring

Could be. Would be an easy thing to check first; just disconnect the inverter and see what happens to your voltage readings. If that does it, then reconnect the inverter leads but NOT the green ground and see if your DC readings stay good.
Old 04-26-2008, 11:23 AM
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Default Re: Help - wiring

Lesson learned - never connect wires in the dark and assume you have them all connected. Negative wire from ground to house batteries was hidden and not connected. Much easier to do in daylight.

Thanks for the suggestions.
Old 04-26-2008, 01:19 PM
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Default Re: Help - wiring

AHHH HAAA! Glad you found it so easily.

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