2016 Nissan Maxima power connection or options for routing?

[sdf678]

I own a 2016 Nissan Maxima. My intent is to install an Icom dual band D Star radio. I have in the past only ran 12V power cables in Chevy/GMC cars, trucks or an SUV. That is pretty simple. The Nissan is a bit more of a pain. Here is what I was thinking to do.

The main body of the Icom will be mounted in the trunk under the rear deck. Two Motorola powered speakers will be mounted on the rear deck. A COMPACtenna will be mounted on the right rear corner of the trunk lid with the appropriate Comet mount so the antenna is vertical. My coax run will only be a few feet. The mic and control head will be mounted on a Lido mount coming up from the passenger seat bolt.

Here is my question. The car has a factory installed amp and subwoofer in the trunk. My plan was to power the amateur radio off of the 12V power lines that are already there for the amp. Since I would never transmit while the stereo is cranked up loud I see no issue with current consumption. Yes, I know, running fused dedicated cables from the battery to the trunk is best. That is the way I always did it in the past. Actually I would like to do that now but as I said it seems to be an incredible amount of work. Any suggestions or do you foresee any issues with my current plan?

 

[mmckenna]

I wouldn't advise it.
Tapping existing wiring is usually a bad idea. The wiring will be bundled in a big harness with other wires, some of which may induce noise on the power to your radio. You'll pull all your hair out trying to track down the issue. Also, you'd run the risk of overloading the circuit since the amp is probably always powered on at some level, plus your radio running.

Never a good idea to use existing wiring in a vehicle unless it is specifically designed for it.
Really is best to route to the battery directly for the positive lead. Ground should be picked up local to the radio.