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So have everything mechanically installed but cant get it to start. I have tried grounding the neutral safety switch but still no start. Help please 

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Electrical and why pcm I just replaced it with a remanufactured for an auto isnt there any other way to bypass it. 

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If it's not cranking at all, you need to jumper the park/neutral safety switch. 

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Jumper the black/white wire at the plug to one of the other wires... I'm not sure which one, but it's likely grounded if you test it. There's 3 wires on the plug, you have a 50/50 chance, lol.

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I did a lot of research on this years back because I was so sure I'd do it one day. One day hasn't come yet. My memory was fuzzy but I dug up some old threads I had saved on another forum. If the engine does not even roll over then the middle black wire in the 3 wire plug to the Auto needs to be grounded. That is the wire for the NSS witch is no longer there because the Auto. is MIA. The 2 outside wires are for backup lites. If you simply ground the black wire the truck should start but the CC won't work because the truck thinks the trans is always in neutral. You should run that wire to the clutch safety switch if you have one. If not get one and use it then the CC will work too.

Hope this helps. Let us know how you make out.

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Ok dave110 let me follow this, as I plan on doing the swap out in the next two weeks. 

If I install a Clutch switch and ground the center terminal of the NSS, the starter should work.

Connecting the two outer wires to the NSS to the reverse switch on the trans will get the back up lights to work. 

Pulling the Park Neutral Switch Sense the terminal from the PCM harness connector should allow the CC to work. 

 

On a second note I have access to a laptop with Cummins Insite through work (we use it to talk to our fleet using 1939 protocol) can I connect it up to my truck on 1999 2500 ISB. I assume it would just be getting the canbus connection to the Nexiq module.  

 

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Ok Red grounding the Black/White wire will get it to start, but having a Clutch switch might be a safe addition. With my luck I would end up jumping into someone in a parking lot by accident. 

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