Alright one electric problem ISX 565

2013 Peterbilt 389, Is this a ground cause of it is I’ve tried to find them all and their all tight any grounds behind the dash I did look there but didn’t see anything high up.

the guy came in with no headlights just markers and clearences. With the key off the lights were staying on also, And while I’m diagnosing I turn flashers on and everything flashes. But headlights still don’t come on. further diagnosing again now the flashers aren’t working and lost dash switch power cuz with the key off I get no light power from switches on. Then I turn the key the lights come on, I turn switches off lights stay on, I turn key off lights go out, and I know on this truck lights still come on with not needing to turn the key. As any other usual truck would. And also that the plugin to the headlight assembly’s. I have power to all pins from 7-10V. Idk which one is ground but I’m sure atleast 2 or 3 should be!! I come back for morning shift now just having headlight switch on key off the markers all flashing and headlights too
. When flasher isn’t on. Also making the trailer clearance lights relay activate with flash along, I turn key on everything stops flashing

 

My test light was showing the voltage readings but it still shouldn’t have power to all the connectors. But while I was reading stuff online the headlights mysteriously started working and that’s when I went to check the headlight harness at the bumper and only 3 connectors have power of 12v.
Thing is I only see one ground and I cleaned it up! I have the chassis schematic now and doesn’t make whole lotta sense to me haha! When the driver pulled in the headlights were flickering, and little bit after they didn’t come on at all. I swapped the switch connector to the other switches and it didn’t change anything.

 

Unfortunately my chassis node plug is round and based on letters.

 

no trailer involved.

 

i found out after I went under the truck I seen what you met! Is there any sort of trouble shooting to go by? Seeing the plugs disappointed how the washer pump isn’t on that diagram lol. Cuz it kept sending power there slightly. But fuel gauge was reading E Before TIA

it’s annoying how everything works now and it’s not flicking or anything on me yet. Trying so.