okie, the fix is not too hard. take a look at the pic in the post that Pikey indicated above. When you take your under dash cover off the right side, and remove the column covers, you will see what looks like an orange wire, but that is actually the sheath over two very fine wires, and those are likely broken. I modified the black loom holder a bit so there was more slack in the orange sheath & wires, then located the breakin the wires. I peeled back the insulation from each of the tiny wires where they were broken, and twisted the wires back together. Then, I used superglue to coat them, bent the repaired ends so they lay flat against the insulation--in opposite directions so the two wire repairs could not contact each other--and wrapped with a few rounds of electricians tape. Put it all back together, and it lights up and works fine. To clarify on the "tow mode"...having the button on does not affect the upshift point. In other words, it won't hold a higher rpm before shifting. However, it does affect the downshift point, meaning it will drop out of Lockup and OD a bit sooner with the button on to prevent lugging the engine, and overheating the tranny. At least, that is what all of my Silverado's with the button did.