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  #21  
Old 11-24-2007
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If I understand correctly and your instruments are not working even while the engine is working, and the alternator has the proper output, then the problem is not with your batteries.

This would tell me to start checking for a bad connection somewhere. Without knowing how your boat is wired it's hard to point to a specific connection. I would start with: Alternator to point of charging? Battery switch to pannel?

It could also be your battery switch itself... we really need to know how your boat is wired before we can give more specific trouble shooting advice.

Manny
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  #22  
Old 11-24-2007
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Quote:
Originally Posted by sailhog View Post
BF,
I had them on both last night in order to recharge them.
You mean while you were on shore power? What kind of shore power charger do you have? Mine is a Xantrex TrueCharge 10TB. It has two separate "channels" - one for each battery. Its output connects directly to each battery. The battery switch need not be on for the charger to work.

The only time the battery switch setting should matter for charging the batteries is when you're charging from the engine's alternator.

Jim
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  #23  
Old 11-24-2007
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Quote:
Originally Posted by sailhog View Post
Are 12v fuse systems like Christmas tree lights in that if one is out none will work?
No. Not unless you have a master fuse or breaker, like your home breaker panel will have.

Jim
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  #24  
Old 11-24-2007
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Quote:
Originally Posted by sailhog View Post
Faster,
The batteries are fairly new, and this is the first time they've been run all the way down. They came right back once the engine had had a chance to recharge.
Define "came right back?" Batteries that have been completely or nearly completely discharged take quite some time to be fully recharged.

Quote:
Originally Posted by sailhog View Post
Also, wouldn't the depth sounder, cabin lights etc. work once the engine was running?
Yes. But I'm a bit curious about this:
Quote:
Originally Posted by sailhog View Post
but I finally got a battery in there, got the engine started, switched the batteries out, and recharged my dead batteries.
How exactly did you effect the battery switcheroo? I'm hoping you either used the temporary battery with jumper cables to one of your regular batteries. Or, if you temporarily replaced one of yours with the temporary battery, I'm hoping you did something like:
  • Install temporary battery in "1"
  • Start engine
  • Switch to "2" (this should be safe with modern, make-before-break battery switches that are in good working order)
  • Put regular battery back in "1"
  • Switch to "both"
I'm hoping that at no time was the engine running with anything in the 12V electrical system energized and there being no battery at all connected. Besides the possibility of toasting the alternator, doing that, you can toast anything that was energized at the time. Don't ask me how I know that.

Jim
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Old 12-04-2007
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This sounds too much like I found on the first night of a North Channel trip last year. I was plugged into shore power with no appliances or lights on except the standby mode of the FM cassette deck. Around 2AM I awoke to the tell tale tones the radio outputs when the batteries go dead, yes I did this before but with previous batteries and other circumstances.

After checking the obvious circuits and narrowing it down to the cabin circuit I traced the wired down and found a very hot auto quality butt splice in the head. A fire would have been next as the fuse was not blowing and the resistance was huge. Before I found the cause I was watching the volt meter drop visibly whenever I turned the Cabin switch on, dropping one half volt in a couple of seconds. Needless to say, I pulled the butt splice off the wire and respliced it properly the next day.

So that's my tale and hopefully your solution might in the end be as simple.

Dietrich

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  #26  
Old 12-04-2007
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Quote:
Originally Posted by dfloeter View Post
This sounds too much like I found on the first night of a North Channel trip last year. I was plugged into shore power with no appliances or lights on except the standby mode of the FM cassette deck. Around 2AM I awoke to the tell tale tones the radio outputs when the batteries go dead, yes I did this before but with previous batteries and other circumstances.

After checking the obvious circuits and narrowing it down to the cabin circuit I traced the wired down and found a very hot auto quality butt splice in the head. A fire would have been next as the fuse was not blowing and the resistance was huge. Before I found the cause I was watching the volt meter drop visibly whenever I turned the Cabin switch on, dropping one half volt in a couple of seconds. Needless to say, I pulled the butt splice off the wire and respliced it properly the next day.

So that's my tale and hopefully your solution might in the end be as simple.

Dietrich

Calliope Catalina 30
this is exactly why i harp on about limiting connections and keeping things as simple as possible. people worry about propane (another thread) and yet i would bet SD's right nut that far more boats have burned due to poor connections. if you paid less than $70.00 for your crimping tool, you're a disaster waiting to happen.
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  #27  
Old 12-04-2007
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I'd have to agree that electrical problems are probably responsible for more damage than propane, but not as dramatic looking most times.

Hoffa doesn't know how to shop obviously...Look here, Here, and Here

Obviously, there's a reason he had to fake his death.
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  #28  
Old 12-04-2007
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Seems like you have two problems,
a) low lights the night before (even tho connected to the pier and charger on)
b) GPS etc.. not engerizing from the 12v panel even tho engine is running; apparently the altenator is working because the batteries are getting a charge.

Since seldom in life does two things go wrong at once let's look for the simple solution.
A) your charger crapped out a1) your charger crapped out because your batteries crapped out or at least one of them did and maybe that boiled off the other

B) while farting around in the battery compartment you knocked loose or did not reconnect either the positive or negative cable that supplies power to your panel; or you reversed a connection (only takes a second) and blew the primary panel fuse.

There is no need to panic, it's not magic.

Alternatively, The more complex response:
While playing monopoly with the kids the lead horsie figure was loose and running around making random shorts in the system by creating lead horse droppings on connections, then it got hungry and ate some copper cable and caused opens in other places.
To fix that requires 4 bottles of rum, food for a week, 3 naked virgins (female, non-minors) and from 8 to 10 viagra's, PM me with my airline ticket reservations and I'll drop in and fix it.
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  #29  
Old 12-05-2007
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It sounds to me like you forget to hook up the + wire for your 12 volt stuff or you have a bad connection to them
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  #30  
Old 12-05-2007
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Any update Hog?
What did you find out?
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