I've build Jim's LED/switch for my 1994 C280 with the 38 pin connector. I used male pins from an RS-232 connector. They fit the 38 pin diagnostic connector in the C280. They are available at Radio Shack, as are the other parts.

As previoulsly suggested, solder and heat shrink the pin to wire junction.

I did have a problem with reading some codes, the voltage at the pin was not +12 volts, but varied from +9 to +10 volts. Couldn't get a code read from those pins, but the rest worked OK.

I was able to read and clear the codes and solve several problems. My mechanic even came up with the same codes when he corrected the problem.

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GeneN
Charlotte, NC
1994 C280 135K