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post #11 of 73 Old 11-23-2007 Thread Starter
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Originally Posted by TrueBlue View Post
If the battery banks are both fully charged, hold at least a 12 volt charge, and none of your 12 devices are working while underway, there's obviously a short or poor wire contact somewhere in the electrical system.

You'll need to test the circuits for continuity, starting from the batttery terminal posts to each device to find the fault.
TB,
Nothing comes on even when the engine is running, which leads me to believe that it isn't necessarily the batteries. I'll need to get the batts tested. I need to do a lot of stuff...
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post #12 of 73 Old 11-23-2007
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SH—

Is it time to start running around and panicking yet???

When you were futzing with the batteries, any chance you might have blown a fuse, tripped a breaker or knocked a fuse loose??? If you have a volt-ohmmeter, you probably should check continuity on all the circuits, and also see what kind of voltages you're getting off of each battery as well as off the alternator.

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post #13 of 73 Old 11-23-2007
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I'm guessing a bad ground connection somewhere is why the 12v system is down. The engine is running power to the batteries, so even if it's running and you aren't completing the circuit the electronics will still be down. Could also be a bad combiner switch. Did you try it on 1 or 2, or just on both?

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post #14 of 73 Old 11-23-2007
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Batteries don't just go like that; blind lead there I'm afraid. You have an open in the circuit somewhere, either via fuse or open connection (very common). You have starter voltage because the battery is a direct simple unfused connection to the starter, while the house circuit is more complicated. You will need a voltmeter or testing light and starting with the 1/2/off switch start following voltages till you come up empty.
I'm assuming at this point that there is no power at all to your fuse panel if nothing is working, so the problem lies between batteries, switch and fuse panel. And since you claim that input power to the batteries from the alternator is working, so it seems like there is an open between the switch and the fuse panel.

All this also assumes you don't have a weird wiring arrangement.

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post #15 of 73 Old 11-23-2007
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Hoffa has it I think. There's a main cable issue somewhere. I'm betting it is the positive to your battery switch from the battery. With both house and starter batts fully charged...do you get any 12V operation from either of them? If not...it is probably the cable from the Perko switch to your fuse panel or the switch itself.
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post #16 of 73 Old 11-23-2007
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Also, no one has mentioned to you that you should not charge both batteries at the same time since one is so much older than the other. One will over charge and the other will undercharge.
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post #17 of 73 Old 11-23-2007
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Assuming the prior posts have not solved your problem, it sounds like an easily overlooked issue - that being the batteries were never recharged fully as you presume. You didn't say how long you ran with the emgine alternator recharging the batteries but if it was only a short time, the bank wasn't recharges sufficiently to maintain the draw being applied.
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post #18 of 73 Old 11-23-2007
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Buy a wee multimeter... they are like Ł20... and check the battery voltage at the batteries both with engine stopped, and with engine running. Running it shout be about 14.2V, and with engine off it will drop to probably 13 V.

Absolutely dead ancilliaries with decent charging is a supply problem to them. Something has blown or tripped.

Does the motor still start from your batteries? If so, it is definitely a supply problem.

Multimeter out. It is not difficult to fix.
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post #19 of 73 Old 11-23-2007
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A very possible place for a problem could be the negative connection if nothing is working. Check and clean at the engine and the neg bus if both batteries are connected to one. Or if you have a monitor shunt, look there too for a common ground issue.
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post #20 of 73 Old 11-23-2007
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12V Troubleshooting

Hello,

As previously mentioned, you need to get a multimeter and start troubleshooting. If you don't know how to use a meter, either get a friend to show you how, or read a book about it. It is not very difficult.

If I had your problems, I would first measure the voltage at the batteries. Then I would open the fuse panel and measure the voltage where is comes into the panel. Then I would measure the voltage at each location you need. If your accessories (GPS, etc.) are all on the same fuse, you may just have a blown fuse. More than likely you have a bad alternator, ground, or broken main lead.

Good luck.
Barry

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