4l60e transmission wiring question.
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I'm doing a LM7 with the 4L60E tranny swap into my 1977 C10 truck. I'm planning on using the neutral safety and backup switch that's mounted on my steering column. Do I need the range selector switch at all on the transmission or does the pcm get all the inputs it needs from the main connector? I've cut all the wires that were connected to the fuse block ( 2 pink, dk.green, lt.green,and grey) and I'm just not sure if there's something I need to do with them.
#2
Banned
iTrader: (1)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The little plug with 4 wires tells the PCM what gear the transmission is in. In HPtuner you can select either full range (PRNDL) or just P/N or none. Make sure you have it on full range if you are using this 4-wire plug completely wired to the PCM.
![Name: PNSWITCH1_zpsbatvosug.jpg
Views: 9113
Size: 11.9 KB](https://ls1tech.com/forums/attachments/generation-iii-external-engine/585813d1501206317-4l60e-transmission-wiring-question-pnswitch1_zpsbatvosug.jpg)
Here is the logic for diagnostics
![](http://i9.photobucket.com/albums/a90/kingtal0n/4L60E-4L80E%20Range%20Sensor%20Logic%20Chart_zpsfdufixpi.jpg)
Now, here is the large plug.
![Name: PNSWITCH2_zps4bdekzjs.jpg
Views: 9328
Size: 13.5 KB](https://ls1tech.com/forums/attachments/generation-iii-external-engine/585814d1501206317-4l60e-transmission-wiring-question-pnswitch2_zps4bdekzjs.jpg)
You need the ground wire on the large plug, for the small plug to pull down the PCM's 12v resisted outputs. That wire is "D" Ground, black/white.
The rest are for various purposes, they communicate with the car, not the PCM. So if you have a neutral switch on the vehicle, for example, and it's already wired to the starter relay, i.e. it cranks the engine when you turn the key, you wouldn't need to use the neutral signal/start signal from this large plug.
Backup lamps might come in handy, though.
![Name: PNSWITCH1_zpsbatvosug.jpg
Views: 9113
Size: 11.9 KB](https://ls1tech.com/forums/attachments/generation-iii-external-engine/585813d1501206317-4l60e-transmission-wiring-question-pnswitch1_zpsbatvosug.jpg)
Here is the logic for diagnostics
![](http://i9.photobucket.com/albums/a90/kingtal0n/4L60E-4L80E%20Range%20Sensor%20Logic%20Chart_zpsfdufixpi.jpg)
Now, here is the large plug.
![Name: PNSWITCH2_zps4bdekzjs.jpg
Views: 9328
Size: 13.5 KB](https://ls1tech.com/forums/attachments/generation-iii-external-engine/585814d1501206317-4l60e-transmission-wiring-question-pnswitch2_zps4bdekzjs.jpg)
You need the ground wire on the large plug, for the small plug to pull down the PCM's 12v resisted outputs. That wire is "D" Ground, black/white.
The rest are for various purposes, they communicate with the car, not the PCM. So if you have a neutral switch on the vehicle, for example, and it's already wired to the starter relay, i.e. it cranks the engine when you turn the key, you wouldn't need to use the neutral signal/start signal from this large plug.
Backup lamps might come in handy, though.