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Originally Posted by Adam in NYC USA
What was the voltage drop across the battery when you engage the wiring harness? BTW, when that capacitor discharges, it has to get that electrical energy from somewhere, like the battery and the alternator.
You might want to see if your new gadgets are not causing excessive voltage drop, which can cause additional ignition noise on the power rail. Not to mention that you will drawing additional power from charging system, causing them to work harder and heat up more.
Measure your voltage.
Start the car.
Let the idle do its thing and kick down.
Measure your voltage.
Play something loud and continous without using any of the headlighting.
Measure your voltage.
Turn on all your gadgets including your lighting.
Measure your voltage.
Nothing looks dim or sounds distorted? Then you did a good job. If it does the same in the dead of winter, you did a great job.
Adam in NYC 
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everything checks out ok, the stereo made noise just as soon as i hooked up the new deck without any load at all, the stock radio did not make that noise. nothing is dim or distorted, started it up in 20 degree weather and no problems. its all good from here!