pablo help

When I drive truck check lights comes on and I get that abs, lights, and every ecu is bad.
One time truck shot down on hwy
When I pull on side checked says data link j 1939
Check wires from vecu to ecu no they fine
Replace a alternatora because had oil inside
I almost forget to say I was at Volvo dealership and they say
It' s not ecu they say they need 10-12 hours but no guaranty if they going to find any problemplease help

 

I forget to tell you that when did shot truck didn't won't start right away but took few minutes
And truck didn't have power before shot down
I am going to check abs
Thanks for help

 

I checked outside I only have valves on back underneath fifth wheel
I going to check inside cab under fuses
I had same battery leak but when I checked voltage for three 12.85 and one for 12.57
Can they do this

 

I checked wires with multimeter and when i got to red alternator wire it beeps when have com multimeter wire on trucks body.
It was geting late so i finish tomorrow.
Would that couse all codes to popup and can starter be bad because or has internal shortage or everything goes through starter.
I know that when i had shot down on hwy didnt start right away would turn but not start.

 

how do you test that?
please explain
today codes popup for every ecu
but one styed active mid 128 sid 33 fmi5
fan clutch actuator
how thas that looks like is that solenoid valve part 20807261