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 > DC inline fuse blows when battery power turned on

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baseball

Georgia

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Posted: 04/14/19 01:44pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 2008 Fun Finder with a DC power issue. I just replaced the battery because the dealer put a bad battery on the trailer. Anyway, when I go to turn on the DC power to trailer, it blows the inline 30 amp fuse. it is located on the negative side of battery. I have a plunger type switch to turn on/off DC power to cabin. the shore power works fine, but not sure it is recharging the battery. Any ideas on where to start will be appreicated. If you need more info to diagnose the problem, let me know.


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Chris Bryant

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Posted: 04/14/19 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

If it just started when you replaced the battery, odds are you hooked it up wrong.


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Toddupton

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Posted: 04/14/19 01:57pm Link  |  Quote  |  Print  |  Notify Moderator

Are you sure that is a negative cable? Not sure why there would be a fuse there except maybe reverse polarity protection but have never seen it done that way. Trace the wire to the frame and make sure positive and negative are correct.

SoundGuy

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Posted: 04/14/19 02:02pm Link  |  Quote  |  Print  |  Notify Moderator

baseball wrote:

Anyway, when I go to turn on the DC power to trailer, it blows the inline 30 amp fuse. it is located on the negative side of battery.


It's not a fuse but a circuit breaker, usually auto resetting, and it should be in the positive cable coming from the battery. Sure sounds like you've connected the battery backwards.


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time2roll

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Posted: 04/14/19 02:02pm Link  |  Quote  |  Print  |  Notify Moderator

Fuse is typically on a heavy black wire to the positive battery terminal.
Main negative connection is usually white and connects to the frame.


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baseball

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Posted: 04/14/19 02:32pm Link  |  Quote  |  Print  |  Notify Moderator

thanks Chris. i swapped them and now no blown fuse, but still no power to cabin. I went to fuse box and checked the two 30a fuses located at top of what i will call the DC distribution panel. no issues. the negative from battery connects to top left terminal on panel. the positive comes in and leaves on white wire from battery on top right. Right beside it is a red wire which the panel says is the positive from converter. when i put meter on the white and black terminals, there was not power. Could this be a bad converter??

time2roll

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Posted: 04/14/19 02:39pm Link  |  Quote  |  Print  |  Notify Moderator

Check the converter is getting 120vac in and should produce 13.5 vdc out.
Although if the battery is charged you should have 12.5+ volts in the DC fuse panel.

baseball

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Posted: 04/14/19 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

ok. more info. i do not have any shore power to trailer. and the white negative is not connected to frame. it goes into a cover in the passthur space at from of cabin. taking cover off, there multiple wires connected via wire nut to the negative. if it is connected to frame, it must be somewhere back towards the rear. there is nothing close to the tongue.

BFL13

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Posted: 04/14/19 03:35pm Link  |  Quote  |  Print  |  Notify Moderator

"the positive comes in and leaves on white wire from battery on top right."

White is negative!


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garym114

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Posted: 04/14/19 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

Get a multimeter and check which is positive and which is negative all the way through so you will know. Makes no difference what the wire color is.


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