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Thread: Hot 12V Wire?

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    Seasoned Camper Grandesigner's Avatar
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    Hot 12V Wire?

    I'm looking for a hot 12v wire out of this bundle, hoping not to have to test each one until found.
    Anybody have some hints to narrow the search?

    Click image for larger version. 

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    Dan and Rita
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    Site Sponsor gbkims's Avatar
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    I'd look to see if one of the paired wire's color lands on the fuse panel.
    Maybe one home runs back to a fuse.
    Click image for larger version. 

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    - Gene

    Kim & Gene
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    If you had a DC ammeter you could check for current. Depends on what the wire feeds and if something is using power. For instance if it feeds a lighting circuit then turn on some lights to see current draw. But if it feeds something like a slide motor you would have actuate the slide. Not the best method, but maybe you will get lucky.

    Unfortunately, non-contact voltage checkers only work on AC.
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    Seasoned Camper Grandesigner's Avatar
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    Quote Originally Posted by gbkims View Post
    I'd look to see if one of the paired wire's color lands on the fuse panel.
    Maybe one home runs back to a fuse.
    Click image for larger version. 

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    Thanks, that's what I did to narrow it down to a purple pair. I then ran a ground wire to the fuse panel and used a light up probe to verify hot. It's the awning circuit per the fuse panel, so only gets used once in a while. Should be good for a 3W led light. I'm thinking of using small gage wire since it's only 3W...
    Dan and Rita
    2021 Reflection150 260RD, built June 2020, w/400W solar + 2 size 31 AGMs added
    Y2K F250 SuperCab 7.3 PSD 4x4, 4 Speed Auto, Shortbed w/slider (never used it)

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    Seasoned Camper Grandesigner's Avatar
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    Update:
    Ran the wire I will need but noted 2 things;
    1. when I pulled the 15A fuse, a little red led lit up next the slot. kind of neat
    2. also, the step light lit up and could not be switched off, so it must tell you a fuse popped?

    Just need some parts to arrive tomorrow to finish this little project.
    Dan and Rita
    2021 Reflection150 260RD, built June 2020, w/400W solar + 2 size 31 AGMs added
    Y2K F250 SuperCab 7.3 PSD 4x4, 4 Speed Auto, Shortbed w/slider (never used it)

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    Site Sponsor gbkims's Avatar
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    Quote Originally Posted by Grandesigner View Post
    Update:
    Ran the wire I will need but noted 2 things;
    1. when I pulled the 15A fuse, a little red led lit up next the slot. kind of neat
    2. also, the step light lit up and could not be switched off, so it must tell you a fuse popped?

    Just need some parts to arrive tomorrow to finish this little project.
    You're right, a 3W light is barely any load.

    The Red LED for the fuse does light up when pull / blow the fuse and there's still a device trying to draw power.

    Each RV can be wired different.
    My Awing fuse powers several things:
    Click image for larger version. 

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    The step light coming on may be a wiring quirk.
    The wires usually daisy chain thru several switches in the monitor/switch panel.

    Sounds a bit like another TT I read about last year where:
    Battery disconnect turned off, Awning and Step lights come on.
    Battery switch turned on, switches turn lights on and off.
    A few wires were crossed somewhere at the trailer's frame mounted circuit breakers.
    - Gene

    Kim & Gene
    2015 Reflection 317RST
    2017 Ram 3500 CC LB 4x2 6.7 CTD AISIN 3.73 DRW Auto Level Rear Air, BD3, Prodigy P3, Aux Tank

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    Did your rig come with the Lippert TPMS plug-in baseplate already installed? It's nothing more than a cheap plastic piece that has power connected. That's a hot 12v line, directly from the battery. Stays on even when the disconnect is pulled, so it might not be fused... I might want to check that, on second thought!

    In our Solitude, it was just below the main battery disconnect. I pulled the Lippert piece and installed a different (much better) TPMS repeater and a push button switch so it's not on while the rig is in storage.
    Colin & Tracy
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    Seasoned Camper Grandesigner's Avatar
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    It did not. I needed a 12v lead near the stove and that bundle is pretty close...
    Dan and Rita
    2021 Reflection150 260RD, built June 2020, w/400W solar + 2 size 31 AGMs added
    Y2K F250 SuperCab 7.3 PSD 4x4, 4 Speed Auto, Shortbed w/slider (never used it)

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