Hello guys i am new here and looking to see if you can help me out with this issue. I have a 2001 Chrysler Town & Country Limited with the 3.8 liter V6. Before i talk about this issue, the van had a huge electrical problem that took awhile to solve, the fuel pump died on the high way so had it towed to the shop and they put a new one in. a few miles later the van didn't wanna start and they drop the tank again and rechecked and everything was good so they repair some wires and the van would start but than when you put it in gear it would stall. Most shops would say the torque converter is locked up which would cause the same exact issue but i think there was a connector at the firewall that had a short everytime the car was put in gear due to a little movement nothing crazy. I just stated the issue before hand so you can see the history of the van.

Their was a leak in the radiator so i was under it and move the wire harness a few times so i can take a good look and when i started the van and drove it is only in 1st gear and is in limp mode. i must have created a power to short or created open or short somewhere in the Low Reverse circuit. I checked the eatx safety circuit and verify the pin that's always hot and the other pin that would activate quickly after you turn the key or crank the engine, used a test light for that test and also test the relay by applying 12v to the control side and it click. I which out the relay with the same one off a different circuit and cleared it with my scanner and it came back on after attempting to shift. i look at the wires between the TCM and the solenoid connector and doesn't seem like there is any damage. I tested pin 4 and 7 on the solenoid pack and it came out with 1.8 ohms which means the solenoid is good and also tested the sister pins and was the same thing. I did a resistance test between the l/r wire and the transmission output wire 16 and than 17 it was 15.58 ohms and moving which means something is going on with the wiring. i cut the l/r wire from the solenoid connector and the TCM and connected the wire with a jumper and did the resistance test again and the same thing but i don't trust my two multimeters since i fooled around with them when i didn't know much about electricity so i brought one for my birthday that was automatic so i am planning on re doing the Resistance test tomorrow. Due to history i think is better said to replace the wire harness which i would agree but wanna see if i can fix it and replace it at a later time. I did do the wiggle test during testing and it was affecting the reading but since i was using meters that was probably damage i can't say for sure until i redo the test with my new meter tomorrow. I also did a continuity test and found there was no open on the l/r wire from the solenoid pack connector to the tcm connector. I guess if i get the same results with my new meter the next thing to check is the transmission output wires on pin 16 and 17 is good and also the grounds on the tcm. so here are my questions

1. Since there is a wire in the tcm connector that get 10-12 volts can i just connect my test light to battery positive and use it to test the grounds in the tcm connector since i would assume as along as it's not pass 12 volts it won't do any damage?

2. Is there any power or ground testing i need to do on the ECU side that would affect the TCM? the only code on the ECU side is just a evap leak

3. how would i go about testing the transmission output wires? since it's power i would think with the car on i connect my meter with one connection on the battery ground and the other one connected to the bare wire via a jumper or connected via a paper clip that is back proved to the wire on the tcm connector?

4. Is there anyway to test to see if the issue is just the tcm? i know you need a advanced scanner but i see some people say the p0700 is a code to let the driver know there is a transmission issue and other says the p0700 is a internal tcm failure. a advanced scanner would go more in depth about the p0700 but they say look for other transmission codes and i guess if there is no other codes other than the p0700 than the tcm is bad i assume

Sorry for the long post but theses details are important to fully understand whats going on with the van. don't wanna junk it, it would be a shame. Thanks