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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > How 12v lights work?

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alexey75

Nova Scotia

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Posted: 05/01/21 09:10am Link  |  Quote  |  Print  |  Notify Moderator

I have an issue with led awning lights blowing the fuse, I am troubleshooting it and have a general question.

When the trailer connected to shore power, do 12v lights get the power from the battery (and converter charges it in the background), or do they get the power from 110v through some converter?

deltabravo

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Posted: 05/01/21 10:06am Link  |  Quote  |  Print  |  Notify Moderator

alexey75 wrote:

...12v lights get power from the battery (and converter charges it in the background)


This.


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wnjj

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Posted: 05/01/21 10:45am Link  |  Quote  |  Print  |  Notify Moderator

When plugged in to shore power, the converter applies a charging voltage to the battery. So the converter supplies the power to the 12V items, including the battery. They are all connected together.

This means the 12V lights, etc. see a slightly higher voltage when on shore power.

2oldman

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Posted: 05/01/21 10:46am Link  |  Quote  |  Print  |  Notify Moderator

alexey75 wrote:

I have an issue with led awning lights blowing the fuse, I am troubleshooting it and have a general question.
Where are these lights plugged in?

Old-Biscuit

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Posted: 05/01/21 11:20am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

alexey75 wrote:

I have an issue with led awning lights blowing the fuse, I am troubleshooting it and have a general question.
Where are these lights plugged in?


Exactly.^^^^

Unless you have added a 12VDC Circuit to exterior typically awning lights are AC

Which 'fuse' is blowing?


On SHore Power........AC goes to Converter
Converter supplies the DC to the FUSED circuits AND maintain battery

W/O shore power Battery then supplies the DC Fused circuits


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alexey75

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Posted: 05/01/21 12:47pm Link  |  Quote  |  Print  |  Notify Moderator

I have the main internal lights and awning led on the same 15amp fuse.
I inspected and disconnected the awning lights, checked the cable that goes inside, checked the switch, all good, but still it blows the fuse.
The panel looks good (not sure what to check).
The only thing that I cannot inspect, is the cable that goes from the panel to the switch, inside the wall.

Any idea what can be wrong and how to troubleshoot it?

2oldman

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Posted: 05/01/21 02:03pm Link  |  Quote  |  Print  |  Notify Moderator

alexey75 wrote:

checked the cable that goes inside
Goes inside to where?

Are these LEDs or not?

alexey75

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Posted: 05/01/21 03:26pm Link  |  Quote  |  Print  |  Notify Moderator

From the awning into the wall.

Yes, these are LEDs

2oldman

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Posted: 05/01/21 03:52pm Link  |  Quote  |  Print  |  Notify Moderator

alexey75 wrote:

From the awning into the wall.
and this 'wall' is a 12v socket?

MitchF150

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Posted: 05/01/21 03:53pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like you have a short in the awning wiring? I assume it does this whether you are on just battery or 120v?

And it's just the awning light that blows the fuse either way?

Turn on your inside lights on and no problem?

Turn on your awning light and it blows the fuse?

Or a combo of both?

Not sure how you test that, but you gotta somehow take the internal wiring out of the equation with some test wires to see if it's the fixture or the wiring?

Good luck! Mitch


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