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Old 12-21-2006, 09:37 PM   #1
jwt873
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Hard wiring a new 5 Volt radio (Starmate 3)
 
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Default Hard wiring a new 5 Volt radio (Starmate 3)

I wanted to hard wire the power to my Starmate 3 to keep my car lighter socket free for my GPS unit. I already had an existing harness soldered under the dash to a 12 volt source that I had used for my old Sirius Audiovox PNP2. The new units use 5.2 Volts so I couldn't use the existing Audiovox harness directly.

I was going to splice a lighter socket to the existing harness then plug the power plug into lighter socket and cram it all under the dash. The problem is, I don't have much room under there.

So I decided to take the converter out of the 5V plug and put it in a tiny little plastic box I had laying around. (Can't remember where I got it).

I had a spare power plug from an extra vehicle dock that I bought for my truck. The plug comes apart easily by unscrewing the tip, pulling off the metal ring and then unsnapping the two plastic pieces. See below:



The circuit board is glued to a bit of sponge to keep it from moving around, but it pulls out easy. After I got everything out, I noted the postive and negative input wires and unsoldered the pieces that contact the insides of the cigarette lighter socket. (I kept all the hardware so I could solder it back on and put the unit back in the plug).

After I got it out, I put the whole unit in my little box. It fit perfectly.

I noched out the lips of the box so I could screw down the lid without pinching the wires. Then I connected the assembly to my Audiovox harness under the dash. (My existng harness had a fuse holder that already had a 2A fuse.. Same as the plug fuse).



That's it
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Old 12-22-2006, 07:34 AM   #2
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Hard wiring a new 5 Volt radio (Starmate 3)
 
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Glad you remembered the fuse...

How's the Heat. Does the box heat up much?

Nice Job!
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Old 12-22-2006, 10:53 AM   #3
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Quote:
Originally Posted by me_rubin
Glad you remembered the fuse...

How's the Heat. Does the box heat up much?

Nice Job!
The box doesn't heat at all...

Prior to transplanting the plug contents, I built my own 12 volt -> 5 volt converter using an L7805CT regulator IC. It's rated at 1.5 amps.. But analog regulators do get HOT. My supply worked, but the heat sink it required made it too big.

The voltage reducer that Sirius provides is a switching regulator built around a 4086T IC. Switching regulators are far more efficent. The circuitry built in to the Sirius 5V plug doesn't even get warm to the touch.
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Old 01-09-2007, 06:25 PM   #4
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Since I have not looked, does someone know if there is a location on the fusebox of an 06 Magnum that I could access 12V for a project like this?
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