[Q] Hard Wire USB Charger into Vehicle - HTC Droid DNA

So here is my plan, and I just wanted to run it by anyone who might be more tech-savy out there than me.
My plan is this (or see graphic)…. To Hard wire a USB charging cable into my vehicles electrical system. (All hidden under the dash) I mainly want to go this route because in the end, the biggest part of this fabrication would be the size of my pinky finger and cost me a total of like $4 for the fuse tap since i have the rest.
So what I will be doing it, taking a Mini (ATM) Fuse Tap and plugging it into the already present radio fuse slot. I’ll then wire the 12v Output of the fuse tap to the input of a 5v Regulator. I’ll ground the regulator to some random metal surface. Then I’ll wire the 5v Output on the regulator to the positive line of a cut USB-A to Micro USB cord. I’ll short out the USB cord’s data wired so the phone thinks it’s charging with AC power and pull the full mA. I’ll ground the negative of the USB cord to the ground post of the voltage regulator and call it a day.
I have considered an alternate route to this…Which would be similar in being that I would use a fuse tap and add in an additional AUX Charging Socket to that line, and adding something small like a giffin USB charger to the Charging Socket, followed by the USB cord. But I am inquisitive and experimental (as long as I can make sure it’s safe first) lol. So I want to give this way a try before I do that one.
Attached it a picture for easier explanation.
[URL="http://www.dimensionengineering.com/products/de-sw050”]5v Regulator[/URL]
Fuse Tap
2a Fuse
USB Cable
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Sounds interesting, but I would go the second route with wiring in an aux cig lighter power port to plug in a small sized USB adapter. Lots of 12v sources under the dash and you could put this anywhere, and run a usb cord from it.
Question, why not just use the cig lighter that is already in your car?

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Because what I want to do is get a window mount for the phone and mount it, then also supply a power cord to be used only for that mount. I don't want a cord strung across my dash, so I'm going the build a new power source and stuff it under the dash method. Plus I still want the full functionality of my pre existing aux port.
Sent from my HTC DNA.

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Oh hi! MECP certified car installer here. Why not just buy a car charger and a second power socket, fuse the positive to a constant or accessory source, and ground the negative to a good source of metal, then plug in and tape up the two pieces? The way you're doing it is way too messy and complicated
Sent from my HTC6435LVW using xda app-developers app

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I must say that I agree with bigred on this one. Sounds like a great learning experience/project. Sometimes, because one way is simpler, doesn't necessarily mean it is the correct way to do it. Bigreds idea seams to be a cleaner final product, with more secure connections. My .02.
Sent from my HTC6435LVW using xda premium

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trickster2369 said:
I must say that I agree with bigred on this one. Sounds like a great learning experience/project. Sometimes, because one way is simpler, doesn't necessarily mean it is the correct way to do it. Bigreds idea seams to be a cleaner final product, with more secure connections. My .02.
Sent from my HTC6435LVW using xda premium
Click to expand...
Click to collapse
Thanks, I broke down and built one. Works out pretty good and provides a steady 5v of what appears to be clean power.
ROFLsplash said:
Oh hi! MECP certified car installer here. Why not just buy a car charger and a second power socket, fuse the positive to a constant or accessory source, and ground the negative to a good source of metal, then plug in and tape up the two pieces? The way you're doing it is way too messy and complicated
Sent from my HTC6435LVW using xda app-developers app
Click to expand...
Click to collapse
Some people might think that it is messy and complicated, but i find it easily customizable (contrary to messy, and not complicated).

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I have done this type of thing in most every rig I've had over the past 10 years, about 4 or 5 I think. I have two reasons for doing it, one is to reduce clutter from the cable across the dash and the other is to leave the existing 12v outlet available for passengers/guests/other accessories.
I would agree with most of the other comments here about installing another 12v socket under the dash. This is what I do, I actually put two under there, leaving one open for future applications. This is more versatile and can be adapted to future devices more easily. All you have to do is plug in the necessary car charger under your dash and run the cable through the defrost vents and to the car dock. I just got done doing this with my wireless car dock in my service truck, new GMC 2500HD, worked out great and I still have two free outputs, one for guests and one for my laptop charger.
But, to each their own and if you already have the necessary parts as you mentioned, then why not. I'm certain that mine cost a lot more than $4 to setup. $9 for the double 12v outlets and $10 for the Palm car charger with usb cord(they push a full amp for fast charge) and I guess $2 for shrink tube and connectors.