Ok, I understand now.

What you should understand is that the number 10 is an input to the PCM through the switch. When the switch is on, the PCM gets a signal that it is ok for OD to be engaged. So you aren't going to see a connection there with ground, because the current running through that wire would be grounded after it enters the PCM.

I would have to go study the wiring diagram to know how the others are supposed to behave, but I'm positive that pin 10 acted how it should have for that test.

Let me look at the wiring diagrams for a while and I'll let you know what tests you should run.

 

Ok, give this a try...

Stick the red probe of your multimeter into pin 37 of the connector and stick the black probe in pin 10 of the connector and set the multimeter to resistance (ohms). Check for continuity between those two pins with the switch both on and off and report back!

 

ok I ran the test. Since my O/D button isnt working currently I have no clue when the switch is on or off so I did this. Exactly what you said and the meter stayed at 1 then I went in the truck and pushed the switch and went outside to do it again and meter stayed at 1. I did this test with the truck off....If I am supposed to turn the key forward please advise. Thanks again I am trying my best.

 

Well if I'm reading the pinouts right, pin 37 should be input to the switch and 10 should be output from the switch. If you aren't getting anything, than either I'm wrong or the switch is bad.

Try this next.... plug the PCM back in, and see if you can get your multimeter probes in the connector while it's plugged in... from the back-side of the connector. Put the red probe in pin 37 and touch the black probe to a solid ground with the multimeter set to 20 volts DC and see if you get a reading from pin 37.

If you do, pull the switch out of the dash and see if any of the wires connected to the switch give you the same reading.

 

I was testing the wrong bays please look below. With the plastic cover off I noticed which is the correct 10 and 37

 

Both the switch and the pin 37 are showing a 5.13 resistance. ( The orange and white stripe wire showing resistance all other wires show .01)

 

Ok I got under the truck and pulled the overdrive sensor switch plug.. One big blue wire. One orange w green stripe and one orange w black stripe. The Blue wire checked out at ground .001 the other two did not give off a reading at all. The meter stayed at 1 I assume these two orange wires are the power and the blue wire is the ground correct? I finally am making sense of all this and am getting close I can feel it...please advise.

 

ok I traced all the wires from the transmission overdrive plug all the way back to the pcm.. the whole way including at the pcm connector I found no resistance on the Orange and black stripe and Orange and Green stripe wire... The big blue is still grounded the whole way but the others show no resistance... Are you thinking what I am thinking? Maybe the PCM is bad? Let me know what you think...Sorry for updating soo much but I am sooo excited to be sooo close but sooo far away... Thanks

 

Ok once again I screwed up...HERE is the DC readings with the red probe and black probe to a solid ground. 11.96 is the blue wires to the switch 8.88 is the orange/white stripe wire. 11.96 is the black wire/orange stripe wire
I just noticed u asked if I would test in dc

Then the top orange wire and the top black wire at the switch are giving no reading or a .04 reading No matter if I push the switch or not nothing changes except the Orange White striped wire.. When I press the switch the volts drop then go back up to 8.88

The 37 pin is giving a 11.96 reading in dc with the key turned forward. Sorry for being soo stupid...I hope this helps..

Pushing the switch also did no difference to pin bay 37 nor did it change anything to do with bay pin 55-56 both of the wires to the transmission switch are both putting out .04 reading no matter if you press the switch or not.

 

Alright... I'm not sure yet what kind of readings the various transmission harness wires should be giving... I haven't gotten that far yet.

But, the 12.4 volts coming out of pin 37 sounds about right. What should happen is that 12.4 volts should either be allowed to pass through the switch to pin 10 or should be cut off by the switch. So now check to see if its reaching the switch and then check to see what happens on the other side of the switch.