BigBlue1124

Almost certain the green (I) wire is not energizing the VR.

After testing the green wire voltage with the key on it shows no voltage. When I energize the green wire via the + battery terminal when plugged into the alternator I get a solid 14.3 V. Finally getting somewhere. I have tested it before and after the plug so it’s bad somewhere in the main harness.

I have thoroughly investigated the green wire up to where it goes into the harness and it’s fine. It seems that green wire runs all the way into the EEC correct? Not excited to tear into that main electrical harness.

Would be easier to run a switch inside the cab to bypass the green wire?

BLDTruth

Is the green wire plugged in at C139 (see the diagram previously posted)? There is a connector, right by the battery tray, with only the one wire going in and out, which must be connected for that wire to function.

BigBlue1124

Yes plugged in and tested before and after the C 139 terminal by powering from the + battery terminal and it worked in both spots

BLDTruth

Had to ask - usually its the stupid things that bite me in the backside. I guess the next step would be to pull the cluster and find the LG/R wire that originates from there and see if it is getting power. If it does, you know the damage is somewhere in the harness and you can just run a jumper wire.

Just remember when you are doing all this work to repeatedly mutter "I love my truck, I love my truck, I love my truck" under your breath and eventually it all works out

Steve83

No, you're not paying attention to what we're posting. Study the diagrams, and read the caption under mine.

BigBlue1124

After re visiting your wiring diagrams I see the LG/R wire goes into the charge indicator and then the instrument cluster. Even though Steve’s wiring diagram and yours are a bit different...

BLD truth, the “cluster” you speak of is the charge indicator or the instrument cluster? Where is the charge indicator located? Seems like that would be the next place to look for wire damage.

BLDTruth

The charge indicator is part of the instrument cluster. There's a voltage gauge and a battery light in the instrument cluster.