daf cf 65

Hello everyone, please i need help from the house…i have a daf cf 65 maual brain box injector…which i bought from england and shipped to africa. It has been running well…i just serviced it yesterday, change oil, fuel filter and valve. Engine still starts perfectly, but the only problem the driver complained to me is the truck turn on an alarm immediately he starts to drive and the engine trips off…and it strats immediately and when he moves 2mins later the engine trips off…but the engine dont trip off when he is just standstill…but i need help i was told its an electrical issue…but i need help from this forum so i can brief the technicians on what to do…pls email me on patoskybobo@yahoo.com