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DroneRider 03-18-2005, 10:14 AM My nbsu switch went out and just replaced it. Now truck wont start. I was careful not to pop out of neutral or misalign the new switch. She wont even turn over now, like it is not in park. All my indicator lights now work, and the only problem I had was that the two connections were frozen and took a lot to get off. Can anyone help me out with this? tranytom 03-18-2005, 10:38 AM I use a heat gun to get them off so I don't brake the plug.Check your plugs for broken wires. Tom DroneRider 03-19-2005, 07:06 PM OK, checked all wires, cannot find any broken ones. Does anyone know where I can get a wiring schematic for the connections that plug into the NSBU? I need to somehow do a continuity test. It really seems to me that the truck does not recognize it is in Park. Max Power 03-19-2005, 07:09 PM Did you try starting it in neutral or in all the gears? DroneRider 03-19-2005, 07:16 PM Yup, just tried it. Nothing. I am starting to get a little frustrated. Would jumpering the park/start switch wires be worth the effort? Bronco 03-19-2005, 08:04 PM Unplug the connectors and plug then into the old switch. Try it. If not stick a driver in the middle and hunt for park. If you still have no luck, you must have damaged the connectors/wires as mentioned before. GMCSID 03-19-2005, 08:14 PM Clear the codes first. DroneRider 03-20-2005, 11:24 AM How do I clear the codes? Nothing new happened with the old switch, none of the shift indicator lights came on, and still would not start. I am going to start looking for park. Does anyone know what letter the wire is to save me a little time. I am guessing it is the yellow wire, but a schematic would be nice. GMCSID 03-20-2005, 12:54 PM You could try disconnecting the batteries for a few minutes. Need info about your truck for a diagram. Diesel Tech 03-20-2005, 02:51 PM Park/Neutral Position (PNP) Switch C1 Pin Wire Color Circuit No. Function A BLK/WHT 771 Transmission Range Switch Signal A B GRY 773 Transmission Range Switch Signal C C WHT 776 Transmission Range Switch Signal P D YEL 772 Transmission Range Switch Signal B Park/Neutral Position (PNP) Switch C2 Pin Wire Color Circuit No. Function A ORN/BLK 1786 B LT GRN 275 Park Neutral Position Switch Park Signal C PNK 839 Ignition 1 Voltage D BLK/WHT 451 Ground & M30/MT1/M74 E PPL/WHT 1035 Starter Relay Coil Supply Voltage F LT GRN 24 Backup Lamp Supply Voltage G YEL 1737 Neutral Safety Switch Park/Neutral Signal This is for a 2003 truck but I think most are the same. Mike L. 03-20-2005, 05:21 PM I'll bet the yellow wire is not making good contact. | ||