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  #1  
Old 12-07-2010, 08:53 AM
thayer's Avatar
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Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
complete seat transplant 90' 420sel to my 83' 300sd

So. the 420 was blue with grey interior. Leather (so the heated seat elements are there)

First, removing the seats is very easy, 4 10mm bolts and unplug the 3 or 4 plugs.

Take your seats out the same way. there are many different variations (4 or 5) of w126 seats but here is the great news. THE COLOR OF THE WIRES IS ALWAYS THE SAME!!!!!!!! Which is such a relief.

Now, in my 83 the plug for the power seats is an 8 hole large gauge female plug. So what I did was I cut the sel plug with about 6 inches of wiring. I then added male ends to the spliced wires

Here are the different female plugs


Male connectors fit great


I had to bypass the main plug. when I got everything connected and tried to move the seat but all I heard was a click. there is a solid state "computer" that I believe handles the heated and memory seats.

Here are the plugs I had to use. there are all plugged into the computer



The Sex change so that the seat plugs would fit into the 83 plug


Match the colors(there are two per 90 plug and each 90 plug has three extra for memory so its going to be a nice jumble, zip ties are as high in my book as duct tape...actually I use a WHOLE lot more zip ties than duct tape).



Bolt the seats in, make sure your plug jumble has plenty of room to move as the seat moves.


I now need to go find the relays and switches with coin tray housing to get the heated seats warming.

Enjoy your leather seats....and keep your tex seats so that when your leather wears out you can put the tex back in. HA!

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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  #2  
Old 12-07-2010, 09:33 AM
vstech's Avatar
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Join Date: Mar 2006
Location: Mount Holly, NC
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... functional at least

I like solder and shrink wrap myself...

so, the motors all work on the new seats, but you've not figured out the heated yet or both work?
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  #3  
Old 12-07-2010, 09:38 AM
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Location: Atlanta, GA
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Could we see some pictures of the new seats installed?
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  #4  
Old 12-07-2010, 09:59 AM
thayer's Avatar
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Join Date: Oct 2008
Location: Mt. Airy, NC
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All the motors work. The heated seats work off of two relays (one per seat) and I need the coin tray frame with the switches. So right now I only have motion, no warmth.

Solder and shrink wrap is nice and permanant. I paid 25 bucks per seat. If I find a better drivers seat I want to be able to just swap it out with no pain. there is the normal wear where you slide in on the drivers seat....left love handle. I'll post pics of the seats once I take them. The rear headrests really make a big difference. My back didn't hurt when I got to work today. So good. Leather is colder than tex, hopefully when I go back today I can yank the relays. if I can just get one heat setting to work at first it would be worth it....I'd be content with on and off.
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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  #5  
Old 12-28-2010, 09:34 AM
Beastie's Avatar
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Join Date: Jul 2001
Location: Brambleton VA
Posts: 793
Awesome ! I drove my 85 300Sd for it's first long drive in many years and loved it except the seats and I was thinking about a swap. I will be referring back to your photos as soon as I find some seats.
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  #6  
Old 12-28-2010, 09:42 AM
thayer's Avatar
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Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
Be sure and get seats that have the heating elements in them and get the wiring harness. I went back to the pick and pull and got a complete heated seat wiring harness only to find out that my seats didn't have the elements in them. Now I have to pull and dismantle the seats, install junkyard heating elements and then reinstall everything. would have been so much nicer to have found good condition seats with the heating elements in them.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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