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91 K5 - Wiring questions

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BadassBlaze

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Hey guys, its been a while. I'm in the process of building a crawler from a 91 K5. I pulled the 4l60/241 last year and finally have my th400/doubler in. I was looking at some wiring and I cannot for the life of me remember what they went to. One is a twisted pair of wires (with no connector, must have gotten ripped off when I was removing the trans/tcase). I'm not sure what this is at all. The other in question is I believe 3-4 wires with a square-ish connector on it. I'm thinking this might have been the VSS wiring, but I don't know for sure.

My other question involves my Art Carr shifter with the Park/Neutral safety switch and Reverse switch. I need to identify my park/neutral safety switch wiring (where is it) and how its activated (did a switch take it to ground in park/neutral, or did it provide 12 volts in park/neutral?). Also the same with my reverse wiring... where is it located and how (and what) was it used to activate the reverse lights?

Thanks in advance guys!
 
The 2 twisted wires are for the VSS and the square plug is for the 4l60/700r4.
 
Awesome. Thanks for the info. What did the square plug control?



Anyone have a diagram of the park and neutral safety switch, as well as the reverse light circuit?
 
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Thanks Eagle Mark.

Am I reading that right that when the switch is closed, 12v from the key to the ecm is provided?

And if anyone has something on the reverse lights, that would be great. Since I don't have the original trans in it any more, and my taillight wiring is a mess as a result of the previous owner, I can't easily trace it out and figure out what I'm looking for.
 
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I read that on the park/neutral safety switch there is a terminal that only goes to ground in park or neutral. Could I use this, tied to my p/n switch on my console shifter, and then just ground the other side of the console shifter switch? Or do I need to put the console p/n switch on the console shifter between the terminal from the ignition and the terminal to the starter solenoid? What does the ground terminal on the factory pak/neutral safety switch do/control? I'm about 3 hours away from my blazer so I can't trace the wire out
 
I'm pretty confused now. What I'm reading is the ecm has to be grounded in park/neutral to know that it is in park or neutral for idle control. So does the p/n safety switch just make the connection (closed) between the ignition and starter solenoid in park, while providing a ground for the ecm?
 
:dunno:

What you do want is the wire from B10 to be grounded in Park and neutral if possible. Then you want it Open/not grounded in gear and neutral if you have to.

What this does to ECM is changes the IAC logic, in Park you get higher RPM for cold start and warm up and a higher idle in Park, then when switch to gear IAC logic changes IAC couints to make the shift smoother and when in gear the IAC logic is in full control and shoots for the desired Idle RPM.
 
87K506 said:
I'm pretty confused now. What I'm reading is the ecm has to be grounded in park/neutral to know that it is in park or neutral for idle control. So does the p/n safety switch just make the connection (closed) between the ignition and starter solenoid in park, while providing a ground for the ecm?
Click to expand...

It just grounds the wire from B10 when in Park and neutral from factory. Not sure what your shifter does but as long as it's ground in Park and open in gear your good! No ignition or starter solenoid involved.
 
I mainly concerned with keeping it from being started in gear. Even if I have the ecm not grounded in gear, it will still start, just may idle weird correct?
 
That has nothing to do with this wire. There is a switch on bottom of steering column for saefty switch.
 
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