3rd gen entune premium + Alpine KTP-445u

The entune premium is a good system, not great, but good enough to not replace. Rather than wire in an amp, I'm looking at putting in the Alpine inline amp and some JBL 6x9s in the doors. That should wake the system up and give it some power for a clearer sound.

Here's my question. Rather than splicing into the stock harness of a brand new truck, I'd prefer to have a jumper harness that I could splice into that I could then plug in between the factory stereo and the factory hatness. Thus, if I wanted to sell the truck, or remove the Alpine power pack, I'd simply pull out the jumper harness and alpine amp and plug the stock harness back into the stock stereo without cutting any wires.

Does anyone know if such a jumper harness exists whereby one end plugs to the factory harness and the other end plugs to the factory stereo? Could one be made?

Any other ideas would be great, too. Thx

 

If you don't have tech pkg with JBL this is very easy using Metra harnesses

$8 70-1761 Radio Wiring Harness For Toyota 87-Up Power 4 Speaker

70-1761 and

$12 71-1761 87 - 94 Toyota Vehicle Harness

71-1761.
This way, you will avoid cutting into stock wiring harness.
I have this setup with my 2nd.
Remember to only turn gain about 1/4 way on the

$349 KTP-445U Universal Power Pack

KTP-445U
Good luck.
PM me if you have any more questions.