IH 9900 Detroit 60 Stalling out

runnin my IH 9900 with the 60 series Detroit ran fine hauling last week now when you given it and right around shifting rpms it cuts out the check engine and stop engine lights come on and the abs light goes out till everything kicks back in and the abs comes on and the check engine lights go away,

I had a similar thing happen before where it was a broken cable in the battery box and I did have a positive connector one broke ii replaced it and tried to go again today and still cutting out I checked all cables and cleaned them and checked the batteries they were all good at a 11.5 Volts its charging when idling at around 13.5 volts

I don't get it is there something i'm missing it seems to idles fine and rev up sitting there but as soon as you try to make it really work or hit the odd bump it cuts out, I believe it's electrical something I don't really excel in

 

I kinda wondered but I didn't see anything wrong with it

I also had the truck at my shed kinda parked on a bit of a slope and I was checking things out outside out of the wind and was wiggling things and and went to move it and it died harder than before still ran but struggled to run when I let off the clutch and the lights were on again and finally it came through and I drove it in to the shed

 

worked on it for a few hours the things I've found are

in the neg side the small white wire has a bare spot in the middle from the 2 part connector and where it does in 4 wires but was still covered up in the loom protector and electrical tape

also found one of the main positive cable to the starter from the battery had a small bare spot but it wasn't touching anything and is away from metal unless it bounced when driving

other than that I cleaned up a few connections was gonna spray down the ecm connections but can seem to get them out and don't wanna break them

would them wires I mentioned cause this?

 

the alternator gauge just starts to go down and then comes back to 13.5 when engine kicks back I don't think It ever reaches 0 cause the engine is still turning when stalled out for a bit and key is on

never really thought of 11.5 being dead still starts fine and everything works as it should and obviously still taking a charge if the alternator is keeping up at 13.5.

spent the morning cleaning connections and checking for bare spots didn't find anymore just the 2 I mentioned before I cleaned them up and heat shrinked them and taped over them, had it running for abit and was wiggling wires and didn't seem to change anything as well as no sparking anywhere, taking it out for a test drive here pretty quick hopefully everything is good to go