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Final update. Relay in, trans light is on now and truck starts in 1st and shifts through all gears. All fixed. Thanks for the help.

No lamp lighting at either state. Did try the circuit breaker as well.

Yes sir. 12 on B. 0 on C.

Correct. You can hear something happening with the relay but possibly just not closing all of the way. Flowed through the TM flowcharge right to replace relay. Mac Motors is only a mile or so from the truck so no big deal to pick one up.

So went through the troubleshooting and leads me to replace the relay so I'll be ordering that today. Interesting though, Pin 3 was going to 290B and Pin 4 was going to 290C. I flipped them back correct, but still nothing. If Pin 4 was connected to 290C, would that just be bypassing the relay?

Thanks guys. Didn't realize about the relay box. I'll be back with the truck tomorrow and will start with fluid level and will test around with a multimeter. TCM is certainly still in place, however one thing I did notice is a bit of electrical tape wrapped around the harness coming into the...

Received my GP M1123 today. Went through it today, put in glass/oilchange/CDR Valve, and then took it for a spin. Drove good, but noticed the transmission wasn't shifting. Did a bit of research and it seems it's in limp mode so I tried the jumper diagnostics...but notice my trans light...