1985 300 SD Cruise Control Problem

[triacon]

I have a problem with Cruise Control. The original switch that should be on the steering column was in the glove compartment for months. I decided to replace it with a new one, so I ordered one and it showed up today.

When replacing it, I noticed that the original one has the following number one it... 126 545 15 24 and the new one in the box is... 126 540 05 44. They look identical. All the wires are the same colors and in the same order.

I replaced it, BUT I did a little "meatball surgery" while in the process...

I decided to undo the solder points from the wires to the switch. I wrote down the colors so as to eliminate confusion... and soldered the new switch to the old wires.

Took car for test drive and found that the cruise control does not work...

Any suggestions on what to do next? First, are the 2 part numbers OK, what I mean is, was it OK to use this new switch? They really look alike!