Based on the TeslaOffer harness and using the Alpine amp... this is the wiring diagram I setup... hopefully I did this right.
I first looked at the wires that were coming out of the Teslaoffer plug harness from the ICE and matched that with the diagram I found of the audio out wires from the stock SR+ harness. Weird thing is that the Teslaoffer harness had all the black striped wires as positive except the Left Rear door.
I then exposed those wires from the black covering on the TeslaOffer harness before they went into the black box that splits off into the other speaker connections.
I then cut those wires and spliced in the Alpine amp. Note that the Alpine amp wires...the black striped wires are negative.
I mounted the Amp under the center console in the large gap between the cover panels. this allowed me to only have to extend the speaker wires of the harness and connect to the Amp input wires. The output wires were long enough to run under the carpet and connect back into the harness.
I ran the power under the floor carpet in the front passenger and down the passenger side door sill panels and connected to the Penthouse.
Couple questions I have for the experts on here:
1. how do I know my amp is working? there's not a light that turns on so I dont know. It sounds good but, and better than without the amp but wasn't sure.
2. how do I know if my ground is good? I found a bolt that was bolted into the body of the car on the console and used that.
3. is my power line running next to my speaker wires bad? I couldn't think of another way to avoid it.
4. my amp is mounted under the console in the gap between the panels: Will this be a heat problem? I saw other put it under the seat bolster...so I figured this would be the same.