Big thanks to Bill (85LebaronT2) for helping me, I couldn’t have done it without his wisdom.
These instructions are for 1987 Dodge Daytonas and possibly other late 80’s Chryslers with reverse polarity door lock systems. The keyless entry system using the DEI/ Avital # 2101L (and the similar DEI/ Viper 451m). This setup is for basic lock/unlocking.
The Avital manual is here online: https://www.directeddealers.com/manuals/IG/Avital/N2101L_2009-01_web.pdf
Here is the list of connections as seen in the picture
I bunched all the ground wires together (Black, Wh/blk and Br/blk)
I bunched all the +12V together (Red and Violet)
Gr/blk wire goes to Gray lock wire
Bl/blk wire goes to Gray unlock wire
This setup will leave the stock switches functional, and the Avital will also be able to lock and unlock your doors. The Avital’ s unused wires can be cut off or saved in a bundle for later use. I did not need to use the horn function or the light blinking function as the locks make so much noise, I can hear them far away.
First go into the door harness. Looking behind the door lock switch the gray wire next to the orange is the LOCK wire and the gray wire next to the pink is the UNLOCK wire. The splice where both join to a common ground is located about 4 inches from the button switch in the harness.
You can see the bulge at the taped harness, there is also a thinner gray wire spliced into all this that goes to the power side mirrors. Cut only the two gray 14-gauge wires that go from the switch to the splice (before the splice), disconnecting it from the switch. You will connect additional wires to these.
Connect two wires or I used a cord and note which is lock and unlock wires, Fish the two wires thru the rubber door jamb boot. Thought the rubber boot would be fraglie, even after 35 years it is pliable. To make it easy to feed thru the boot I dislodged the boot end at the body to slowly feed if thru, with one hand inside the door and the other hand moving the boot around to feed the wire thru.
Inside the car remove the lower dash and side kick panel. Can be done without removing the lower dash but better to see everything.
Then feed your two wires/cord into the body and behind the wires next to the foot brake.
I placed the Avital behind the kick panel underside of the dash.
The ground wires can be connected to the existing ground screw behind the kick panel.
The +12v power I connected to the existing Red power-seat connector also located there.
Lastly connected the lock and unlock wires to the Avital accordingly.
Boom everything works, even with the remote more than 30ft. away. Took two and half hours, but I had prior experience taking the door trim off from before, replacing/rebuilding the window scrapers.