Truck won't turn over, dashlights+running lights wont turn off, HE

Paul Kendall · September 20, 2016

Hey guys,
So over the weekend I put a new (to me) transmission in my truck (2003 silverado 1500) upon finishing the job I went to start it up to start pumping the new fluid through, but the truck will not turn over. All lights, radio, ect.. come on, but the truck will not turn over. Also, even after I have pulled the key out, the front marker lights, rear running lights, and dash lights all will not shut off. There is a high pitched ringing coming from the engine compartment, which, along with the lights shuts off when I pull the fuse for "ECM B". Initially I thought this was the Park-Neutral safety switch, which was cracked while we were installing it. The only idea I have left is that there is a small wire that comes out of the harness and attaches to the back of the engine right behind the passenger side cylinder head that was broken while installing the dipstick, I cannot find any information about what this wire is for or where it is supposed to be attached. ANY help would be much appreciated!!!

diyer2 · September 21, 2016

Did you disconnect the battery before starting?

Did you replace the switch?

Fix the wire? Probably a ground.

Did you short anything?

Paul Kendall · September 21, 2016

no unfortunately, like a dummy I did not disconnect the battery before I started into it
I did replace the switch yesterday, still no luck.
I will fix the wire but it is in such an awkward spot between the firewall, cylinder head, and fuel rail so I cant even see back in there to find where it hooks up

rdnkcpa · September 21, 2016

I suspect that the ground wire in the awkward spot is part of your problem. I replaced the heads on my son's S10 and left a ground wire off the back of the head. When I got in to start, no joy. Took me a while to find that ground. Once I hooked it up all was good.