12v Outlet Fries Chargers - SailNet Community
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post #1 of 13 Old 08-01-2011 Thread Starter
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12v Outlet Fries Chargers

My 12v outlets have blown fuses on my Garmin plug, (I thought the plug was bad) and now cooked my wife's iphone charger (sorry honey!). Any ideas why? I have two, it happened from both. Could they both have gone bad? Or can the wiring or batteries be responsible? The spotlight works in the same outlet.
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post #2 of 13 Old 08-01-2011
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Were the chargers designed to plug into 12v dc or were they dsigned to plug into 120v ac. Just wondering.
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post #3 of 13 Old 08-01-2011 Thread Starter
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12v, car charger types.
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A few minutes with a volt/ohm meter and you can trace out the wiring to find the short. If you don't have one head to Radio Shack and get one.
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post #5 of 13 Old 08-01-2011
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either AC across them, or over voltage...
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post #6 of 13 Old 08-01-2011
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12 volt outlets seem to short if the plug is not inserted straight and all the way in. it's happened a couple of times to me.

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post #7 of 13 Old 08-01-2011
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Check the polarity and be sure they're negative ground. The chargers and the Garmin would care, the spotlight wouldn't.

Bill
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post #8 of 13 Old 08-01-2011
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Originally Posted by btrayfors View Post
Check the polarity and be sure they're negative ground. The chargers and the Garmin would care, the spotlight wouldn't.

Bill
I suspect the same as Bill. The red + wire goes to the center pin and negative to the socket walls reverse this and you'll blow many modern chargers...
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post #9 of 13 Old 08-01-2011
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I had a similar problem and found that my unit was shorted!

Now I have a problem that I cannot find a replacement unit which fits the ca.22m socket on the switch panel i have!

Also make sure you are using appropriate sized fuses (typically 10amp) for the cigarette lighter socket. do a quick calculation by dividing ivide the number of watts by the voltage.

cheers
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post #10 of 13 Old 08-01-2011
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"12 volt outlets seem to short " That would blow the fuse/breaker to the socket, not the fuse in the lighter plug or device itself.

I vote for a failed regulator in the boat, putting 16-17 volts on the "twelve" volt system instead of 14.3-14.4. Second choice, some AC leakage into the system.

Spotlights are very tolerant resistive loads, you can run 'em for a while at 16-17 volts before they burn out. Versus most electronics, which will become toast at 15.
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