Hi Again

I need some advise on which way to go. After connecting the passenger power window and having a look at the wire harness i found the previous owner has tried to tap into what im guessing blinker break wires for trailer plug im guessing but this guy butchered this wiring. After checking all dash and both sides running down towards back wire loom i can see a lot of cut wires and joined together looped im still not sure what he was thinking.

Now my main concern is A/t Temp light and check engine light. After checking Auto ECU this guy has tried to tap into this harness as well. All earth were joined together looks like his jumped wires from the black main harness plug under the heater aircon control under the radio. Auto ecu has sensor or solinoid coloured wires which look similar to what im guessing are the door switch wires alot of black/red gree/yellow wires cut looped. It starts under glove box, under passanger seat there is alot of looped wires and im not sure if it originally went towards the plug through the chassis or was connected towards the back door and barn door?

My symptoms Auto gear box when in Drive 1st gear is normal i think 2nd is good too when chaging into 3rd on some days can slip a fair bit and i have to backoff for it to grab and continue in 3rd. But then i get different symptoms were when i select drive it thinks its N im guessing, and other days when slidng gear lever to 2nd it thinks it N im guessing and wont select any gear and continue into drive then it continues to 2nd and 3rd good with barely any slip gets to 100km fairly easy??? some days wont get into 3rd and i have to get home with 2nd gear can be embarrassing at times in peak hour.

What i notice when in reverse with my break pedal pressed my right blinker is constanly on at this point i get my SUB TANK light on. So i removed rear lights and cut what ever this guy looped or tried to connect and it sorta fixed that but i havent connected light back in.

Now my question do you think i should look into another wire harness to connect or do you think its worth getting the Patrol Auto Stand alone after market ECU with pretty much everything you need not to use original harness? Or will this then mess with the Engine control Module and crank or idle sensors or even worse earthing issues?

Im scratching my head at the moment and dont know if i should call auto sparky or gearbox specialist or get new wire harness and try myself.

Any feed back would be appreciated im really trying to fix this quickly ive had this 4x4 for a couple months and im not confident in taking camping or offroad with all these problems. There is only so many questions you can answer with my 5yo son hanging around me while i try match plugs to wires..... What is this dad what is that, when we goin to beach dad and can this forby connect to our camper trailer or what questions that you can tolerate.

Im going to give it 1 more day in trying to work out these loops and jumped wires before i snap and make it a full strip down panel beat rust remove job