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Old 02-18-2013, 05:07 PM   #1
Dads Burb
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Join Date: Nov 2011
Location: Bothell, WA
Posts: 63
4L60-E Neutral Position Switch Wiring

I have a 2003 Tahoe 4L60-E Trans. There are 10 wires coming off the NSS on this trans.
1. BLK/W to pin C1-32 (PCM)
2. WHT to pin C1-34 (PCM)
3. YEL to pin C1-72 (PCM)
4. GRY to pin C2-62 (PCM)

5. BLK to GRD

6/7. (2) PNK's to Under hood fuse block

8. GRY to pin A11 (Trailer Backup Lamp Supply Voltage - under hood fuse block)
9. LT GRN to pin D3 (Park Neutral Position Switch Park Signal - under hood fuse block)
10. DK GRN to pin F11 (Park/Neutral Start Swicth Signal - under hood fuse block)

Trying to build a stand alone harness from this harness and need to know where the last 3 wires would come from? I have the underhood fuse block, but don't know what the source is for those last 3 wires, what do I tie them into?

Any help is appreciated.
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Old 02-22-2013, 07:58 PM   #2
TchncnDen
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Join Date: Apr 2012
Location: Denver, CO
Posts: 232
Re: 4L60-E Neutral Position Switch Wiring

If I remember correctly these went hot when active. I used #8 through a grounded relay to control my reverse lights and #10 through a grounded relay to break my purple starter wire. On the reverse I just ran a hot to one of the switched sides of the relay and the other all the way back to the reverse light. I did not use #9 but I think it does the same thing as #10.
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