Don Ridley

You may have to install relays to isolate the new lights from the OEM lights. I don't have a wiring diagram for the 2021 (I have a 2016) so I dont know how the turn signals are controlled. If they are LED, they are most likely controlled from the BCM using a pulse width modulated (PWM) signal. This PWM signal will be sensitive to driving anything but the OEM light so a relay should solve that problem.

My 2016 has DRL and they can't be turned off. Your Ford dealership can disable DRL. Programs like Forscan can also disable DRL but it takes several hours of research/learning to use Forscan.

Here is a link to wiring diagrams for your van: Repair and Diagnosis — 2010 Ford Transit Connect L4-2.0L Service Manual | Operation CHARM

There is a drain in the box that holds the heater core and evaporator. I think you can access it from the passenger footwell by removing the side cover. Here is PDF showing the cover. Access will be difficult. evaporator.pdf

Impressive. Glad I could help.

Sorry for the late reply. My TC is a 2016 and it came with the seats. You may find that adding seats will require some metal work and/or welding. Can you find a TC that you can rent to see the configuration?

Yes, I have the SWB van. The brackets for the front of the seat assy appear to be welded on the higher section of the floor (not under your black plate). Ignore the wires in the photo. They are for aftermarket heated seats.

Probably, but it wont be easy. You will need to reseach what is necessary to do this on a Focus then hope it works on a TC. You will need get and learn Forscan. You are looking at new modules (computers), programming etc. Start at the website for Cyan Labs. They sell kits but probaby wont be much help for cross-platform modifications.

Sound deadening is a science and you can go down some deep rabbit holes on the internet trying to find a reasonable solution. You want two types of deadening material: the heavy butyl stick on panels like Kilmat, Dynamat etc and soft foam-like insulation. The Kilmat panels only need to cover about 30% to be effective. I loaded the door panels and the rear floor with them. The softer insulation works like you would expect...it blocks sound as opposed to the panels that keep the metal from creating sound. So, just put something in. It will work better than nothing. FYI, all vehicles are made with sound deadening panels on the body panels. They look like painted over patches of tar.

The rear seats clip into brackets that are on the edge of the footwell on the front (covered by the black plate in your photo), and brackets in the back (that are shown in your photo). Here are photos of one of my rear seats flipped up into the vertical postion.

The TC was built on a Focus platform. But I don't think the Focus was sold in the US with the 2.5L engine. I doubt you will find any 2016 vehicles at Pick n Pull or other self serve junkyards (I have never seen a Gen 2 TC at any Pick n Pull and the newest Ford truck or van I have seen was a 2013). These newer cars are usually purchased by standard junyards. Try contacting one of them to see how mych they charge for wiring harnesses. The good news is 99% of TCs have the same 2.5L engine.

Pressing the switch on the tailgate sends a GND signal to the BCM to tell the BCM to open the tailgate. If your connectors are differnt from the 2016 wiring diagram you will have to do some testing to find the right wires. First, find the wire going to the BCM from the tailgate switch. Measure each wire with a voltmeter. Find the one that goes from 12V to 0V when the switch is pressed. Next, find a ground wire. Use the resistance setting on your voltmeter to measure 0 ohms between a metal ground point and the wire. If you are not sure of the proper ground wire then you can connect to any piece of metal on the tailgate for a ground. Connect one terminal on your new switch to the GND point (or wire) and the other terminal to the BCM wire you found in the fist step. When you press the new switch the BCM wire should go from 12V to 0V and the tailgate latch should activate (tailgate has to be closed to activate).

You do not make changes to a Transit Connect using "as built" data. Look for menu selections under BdyCm (main). You will find global window options.

Here was my solution. https://fordtransitconnectforum.com/topic/6031-turn-on-all-interior-lights-2016/

As you already mentioned, your 2014 may be an early version that had different firmware. My only suggestion is to try different Forscan settings, even ones that dont seem to apply or make sense.