IH 9900 Detroit 60 Stalling out

The ABS is for the trailer been on since I hooked onto this trailer my mechanic told me not to worry about as it a common thing

 

batteries alone when unhooked at cleaning were all 11.5 each and truck running voltmeter shows just shy of 14 volts

Truck is running good now i'm not exactly sure what fixed it cause I did quite afew thing mostly cleaning cables and tighten and such the bare spot on the neg for the ecm I taped over it tightly for now till I get a new one then I will fix it right

 

hey everyone

quick questions, the wire that had a bare spot it comes off the ground post on the battery as one wire then goes into a connector you can split it's just a male female style of connector and then it goes into 4 wires that run along the frame tot the ecm and so on, can I cut that connector out? there's not fuse or nothing so I can really figure why it's there

I went to the dealer and it doesn't show one of them connectors being there and I cant find that style of a connector, I bought new wire and crimp and a new eye but I was wondering what everyone here thought

 

@AModelCat

I've seemed to narrow the problem down to where when the truck is really running hard like up and hill is when it cuts out it doesn't seem to cut out as much any more just when it running hard up a hill and I tried on the way home to make it go empty I put the pedal to the floor and ran to about 1800 rpm them it kicked out again so it seems like under hard power it kicks, my neighbours say the throttle position sensor what are your thoughts

so far I've narrowed it down to the batteries, throttle position sensor or the ecm itself, also do you know if codes are stored inside the ecm? I don't have a check engine light now but if I got a scan done if possibly something would come up