Since I was doing all this in the back area already, I started to think that it would be nice to have a power point back there. It turns out that there is a hole in the right rear pillar just right to give you some space to put in some receptacles. I bought
this set from Amazon. I liked it because it had a switch, a 12v power point, two USB's and a volt meter. My thinking was to switch the whole thing off and on right there so that you could draw power without having the ignition turned on. The voltmeter should help prevent you from discharging the battery (unless you happen to leave it on, in which case the volt meter and the USB will be drawing some current.
Here's how I did it:
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(I did wash the panel before going too much further)
Once I had cut the hole with a dremel moto-tool I temporarily screwed it in and then masked it off. This area of the panel is not flat so I filled in the gaps with black gasket RTV, which is nice because it does not have a high shine and it matches the panel pretty well.
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After smoothing with my finger I peeled off the masking while the RTV was still wet (something I learned doing silicon sealant in bathrooms). Ended up pretty nice I think.
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Here's the wiring on the back:
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I chose to solder to the lugs rather than using spades (which I've always been a bit suspicious of). I also used a little RTV to prevent the screw in devices and hold down screws from coming loose.
One other note: The switch has an LED indicator light that is on when the switch is off--so you can see it I suppose. I measured the current at 12 volts and it was a bit over 10ma. While not a lot I decided I did not want any constant drain, so I did not wire up the indicator light.