Grounds like where the battery wire connects to the rad support, engine and engine to firewall

 

I haven’t checked that and I definitely can do that, but right now I’m just lost

 

I had one more sensor to check (O2), I tested the voltage coming from the ECM and its reading around a (.25-.35) I saw the regulation is supposed to be (.5) and it's supposed to fluctuate. What do you think about that?? have I found something?

 

if you unplug it it should go to a default reading of .450-.500mv. it should run better if its disconnected, but i know if it will kick the whole system into "open" mode and read default readings (like when the engine is cold). does it fluctuate when you rev the engine?

 

When I unplugged it ti went to (.16) that's unplugged and the key on. I kept messing with it and then it went back to (.5) but when it would stall it would go down to around (.35) and then go back up to (.5) when its running good. It's just weird because before I started messing with it the Volts were really low. I took it out and it was jet black, I also see where the voltage is supposed to fluctuate at idle, but mine stays put. And do you know how many O2 are on a truck

 

should only have 1. its job its to monitor the air/fuel ratio.

 

Yeah that's all I see is one, mine isn't fluctuating as I see in most of the videos, it's just staying at a steady (.35 - .50)

 

The O2 connector signal wire with the key turned on is showing a (.26) shouldn't I see a (.50)?

 

what were you messing with when it was unplugged and reading .16?

 

That’s the O2 signal wire with the key off, (.26) when the key turned on, but I saw where it’s supposed to be .500 regardless and then fluctuate from .10 to .90 when operating properly?