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Old 06-07-2015, 07:40 PM   #1
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Adding 12V usb ports to Truck Camper.

So, I am wanting to add something like the picture below to the truck camper, and the plan was to wire it directly to the coach battery so it's hot all the time. The only thing that concerns me is battery drain from it a constant hot source. So, another option would be to wire it to an on off switch. What are your thoughts on wiring something like this up?

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Old 06-07-2015, 07:51 PM   #2
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If it has an LED, it will eventually run the battery down, but a single LED will take several weeks to drain a truck battery. If it doesn't have an LED to show it's on, it won't draw any current unless something is plugged into it.

As an example, my motorcycle battery will go dead in about a week if I leave the GPS on. USB things don't normally use much current, but if something is left in the power plug, it could drain the battery as soon as overnight.
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Old 06-07-2015, 08:08 PM   #3
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Quote:
Originally Posted by mriderLeon View Post
If it has an LED, it will eventually run the battery down, but a single LED will take several weeks to drain a truck battery. If it doesn't have an LED to show it's on, it won't draw any current unless something is plugged into it.

As an example, my motorcycle battery will go dead in about a week if I leave the GPS on. USB things don't normally use much current, but if something is left in the power plug, it could drain the battery as soon as overnight.
I would more than likely buy something that does not have an LED on it, and it would only be used on camping trips when phones and the like needed to be charged... Sounds like I'd be ok wiring to the battery...
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Old 06-07-2015, 08:16 PM   #4
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I installed these all over my class A but I tied them into a reading light switch so I have no drain unless the LED light is on. Plus you have power already there.


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Old 06-08-2015, 07:43 AM   #5
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I would wire the 12 volt accessory outlet direct to the battery via the proper size fuse. DO NOT FORGET THE FUSE using 10ga wire.. Why 10 ga.. Voltage drop.

Then wire the switch between the 12 volt port and the USB port.
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Old 06-08-2015, 08:04 AM   #6
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I would wire the 12 volt accessory outlet direct to the battery via the proper size fuse. DO NOT FORGET THE FUSE using 10ga wire.. Why 10 ga.. Voltage drop.

Then wire the switch between the 12 volt port and the USB port.
No matter how I wire it, there will be an inline fuse..
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Old 06-08-2015, 10:54 AM   #7
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No matter how I wire it, there will be an inline fuse..
And 5v fuse should do it.
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Old 06-08-2015, 07:27 PM   #8
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I have added a USB charge port to our dash, not a problem.
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Old 06-08-2015, 07:37 PM   #9
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Not to disagree, but if you drive often or charge up, I wouldn't worry about a the LED drain. Not significant.
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Old 06-08-2015, 08:53 PM   #10
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It'll only be driven once a week at most.. probably less than that.
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Old 06-08-2015, 09:02 PM   #11
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It won't be a problem, then. Maybe off season or in storage would be different.
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