12 volt USB Charging Port

by Greg Zimmerman
Published: Last Updated on

Having a 12 volt USB port gives us more charging options.  We can charge devices on battery (no hookups or AC power).   The lone 12v outlet for the TV wasn’t enough so I added a dual USB charging port.

To access the area I mounted it, the furnace grate was removed by drilling the 2 rivets out.  The charger is a Seadog marine version for boats.  With dual 2.1amp ports it can charge tablets and phones.  It needs a 1 1/8″ hole to fit.  

For power I tapped into the furnace 12 volt wires.  The wires coming from the furnace are red positive and yellow negative. Casita splices them into different color wires. On ours the white is the negative and red is the positive.  For the splices, I used “posi-taps” which are more secure than the crimp on splices.   They’re also re-useable.


Lee December 27, 2018 - 11:08 am

Nice looking installation. Where did you get your wire taps. They sure look a lot better than that crap Casita uses.

Greg Zimmerman December 27, 2018 - 11:21 am

Amazon sells them in all kinds of assortments. I’m sure they’re too expensive for production lines, but they’re the best splices I’ve found. They screw on by hand and can be re-used. https://amzn.to/2CyZcMY

Dan Casey January 1, 2019 - 3:49 pm

Nice install ! What gage wire taps did you use ?

Greg Zimmerman January 1, 2019 - 4:23 pm

Yellow taps which are good for 10-12 gauge wire. I used 12 gauge wire which is a little overkill, but I like things heavy duty.

Kevin June 16, 2020 - 11:45 am

I tried hooking up Red positive and white negative coming off the furnace, using Posi ties, all I get is 6 volt….any suggestions.

Greg Zimmerman June 16, 2020 - 11:51 am

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