I've got an 88 F-250 with the 7.3 that struggles to start. It turns over very slow like a dead battery and sputters a few times before it finally starts. Batteries are at 100% with no corroded cables. Bad starter??

Thanks
Brian

 

What do the battery cable look like? They have a tendency to corrode inside the ends and get weak continuity. While cranking, do they get warm to the touch?

Could be starter, but I would check all cables first.

 

How are you checking the batteries are you load testing them, batteries can have 12 volts but fail a load test

Just replaced positive battery cable on my 97 because of the same exact symptom

Down by the starter look at the connector if there is a little but of corrosion on the wire there could be more inside