Diesel truck will not turn over. Nothing happens. No warning lights or bad code

If you turn the key and nothing happens, the first thing to think of is if your battery (batteries) are fully charged and able to handle the load of the vehicle's electronics, coupled with the starter motor drawing enough power to turn the Diesel engine. Start testing here. There is a wide open direction of testing that you can explore if the batteries test good -- but you have to start with the basics. www.repairpal.com/repair-shops