Help! Truck won’t start!

[ktbtrucking]

Iam with JMBT here. Turn the key to on position and listen to the prime pump.
MY stories with cranking and no start are as follows.
-changed the bateries but did not tighten enough them ( had vehicle manintnce fault on volvo 2006 isx
-put the batteries the other way ( cranking no start , blow up the fuse on batteries, there are two on volvo 2003 isx and batteries go with minus inside,towards passanger side it is the opposite on 2006 volvo
-cranking no start , connected insite and with the help of ppl from the forum diagnozed bad high pressure pump-

so first thing to check is to turn key on and listen to prime pump
mostly when a lot of codes pop up it is loose connection or popped fuse from my experience