I had put a fuel pump on it an a water pump,an the hose burst on top where the termestate is .when I see that My voltage started going down the Truck cut off after the hose blow. Please I need an answer so let me know.it a gmc subran motor size is a 7.4 454 4 4 drive 2500,3/4 25 ton..

Have the entire starting/charging system tested. It is possible that coolant got on the alternator and the alternator may not be charging the battery properly.

Check any wiring around where the hose blew, may have done physical damage or separation?