so on my 1987 300td, i have gotten most of the wiring sorted out. whoever did all this is a fool. under the driver's side carpet, there are some hacked wires. 2 large red ones were cut and spliced into 1 that goes to the back. what are they for and why would one do this? and the 3 small ones? i soldered those up and heat shrunk them btw. i have no power sunroof, locks, or power passenger seat at the moment. i notice a clicking noise from the passenger foot well when coming to a stop sometimes or even when just sitting. sounds like a relay. what are the plastic and metal boxes for on that side? thank you!

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

The box in your third picture is the anti theft alarm controller. Made by Becker for MB.

I'm assuming you got hold of a decent set of schematics.

Note however that if you got yours from w124-zone.com there are a couple missing sheets in the set. There is a link with a drop down to retrieve the missing sheets. One of them is the alarm so you will definitely need that.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech