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captddh
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My starter battery went dead while on anchor on teh River. No sweat,...I had jumper cables for just his kind of problem. I went from one of the batteries on the 24v system to get the kicker started. to my dismay, smokes started coming out from under the dash. Fire at sea is not what I relish. Turns out the negative unfused wire fried to the stero on the other battery of the 24v system. I have no clue what happened. Any ideas? I'm going to put a starter pack in the boat from here on out or unhook everything 1st. Fortunately, everything else seems fine.
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trumar
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my guess is you use 24 volts to jump start a 12 volt system 
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"When it comes to family-Sometimes it not all about fishing" ~Trumar 2009
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The Chucker
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if you are going to jump 24v to 12v you need to make sure you hook up to only one battery. my guess is you or one of the buddies hooked pos on one batt and neg on the other batt.  hey, it happens. its called learning
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This is why we can't have nice things...
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Rootski
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I can see one way this would happen....
IF you have an aluminum boat;
IF the negative side of the battery powering the stereo was connected to the boat;
IF the negative side of the battery powering the starter on the outboard was connected the boat;
And finally IF you connected the POSITIVE side first......
Then the power would return through the hull, back down the negative wire from the stereo and back to the battery. The wire going to the stereo is sized to handle a little bit of current, certainly not the amps used to charge a battery or turn over a starter. Poof! It's going to melt.
You could use a meter to see if things are connected to ground or not, and if so I'd recommend discvonnecting everything from the jumper battery before hooking up the jumper cables. You could also make sure to connect the negative side of the jumper cables to the battery first. That makes a parallel path for the current that can handle the power.
Glad to hear that you didn't have a fire and that nobody got hurt!
Rootski
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Bassn Dan
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It sounds like the jumper cables were connected to 24 volts. There is a "jumper" that connects the two 12 volt batteries in series to make 24v. This is either directly from battery to battery, or in the "plug in" that you connect to with your trolling motor.
Nothing wrong with using jumper cables to start your motor from the trolling batteries of a 24v system - just be sure TO DISCONNECT THE TROLLING MOTOR BATTERY FROM THE 24 VOLT SYSTEM FIRST!
Good luck, and I hope nothing else was damaged by the extra voltage.
Dan
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Problems Jumping a Boat Battery
