Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
typically its the starter and the best way to tell is if it fauts,put you test light on the switch terminal at the starter,thats the little wire that is on top of the starter,that is power to start,if that wire is hot with the key turned ,then its the starter,if you have high mileage it will be a good time to clean battery and frame grounds to..
Let me know if you have anymore questions.
you will have to ask the moderators on the site,they will know
Try cleaning all the connections at starter ,batteries and frame first if you like,but its sounding like a starter..