YOU KNOW what ive been telling him his rca's are of mad cheap quality! They are from a cheap amp kit but when i insatlled the rca's their were no breaks in the line i checked properly and when i was laying in the rca's it was fine i made sure it wouldn't pinch.....But i guess he shoudl invest in soem 20-30 rca's just incase if that testing whiel driving doesn't seem to be the problem.