Ditto on bypassing the NSS. It is there for a very important reason. I was trouble-shooting a "no start, no sound" on one of our cars in the church parking lot years ago. I had a multimeter and had decided "something bad in the starter relay". I was considering jumping around it, when I found that the NSS was open to ground. Rather than jumper, I poked my head in the cabin and found the lever in "D". My wife had driven that morning, and was the one complaining "won't start". Those watching were impressed with my skills, but I should have first done the "let a man try it".

He did that already. It does jump the NSS but it also jumps the ignition switch so it's not a definitive test for a failed NSS because the problem could still be in the ignition switch or the switch wiring.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

the box pictured above is the box under the hood, that ive already jumped and was able to crank the car. now i need to jump the wires in a box above the accelerator inside the car, looking for what wires i jump on this box

oh , didnt see the last two posts, so yeah anyone know how i can check to see if its in the ignition switch

Yes, jumping the NSS

Either jump it at the NSS or look at the color of the wires and jump them under the dash somewhere. It wouldn't be unreasonable to think MB used the same colors on the SD as the D.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

If you don't want to jump the NSS, just replace it, then you can get the answer.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

so i found a wiring box above and to the right of the acceleration pedal, had six wires, i jumped the purple with the purple and white stripe with the ignition on and nothing happened. so it cranks when jumped from under the hood but doesnt crank when jumped from under the dash. so ignition switch?

does it make any sense that my ignition switch went out right when i was having to replace the shifter linkage bushings because i was having to shake the shifter to get the car to start and the car was tough to get to lock into park?