The grinding noise is that your bendix gear is worn or not engaging fully (bad solenoid). Sounds like you need a new starter or at least a new solenoid to me. Typically a fully charged battery is at 14.4 volts but low voltage typically makes the starter barely turn over and thats at around 11 volts or less. Either replace the solenoid on the starter or the whole starter would be my guess.
Phil
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These days my truck (2007 Volvo VN670, Cummins, 10 Spd) is doing ugly on me. For a couple times, it didn't start. Battery voltage from 12.4 to 13.3. Engine cranks, but along with odd noise during the cranking, and today, 13.3V just finished refueling the tractor, trying to start the truck with no joy! Have to get it pull-started.
Here are my concerns.
1. Why those odd noise like skidding gears? 2. During my trying to start the truck in the fuel island, two other drivers approached me saying "it sounds like a BLOWN FUEL INJECTORS"? What is that? Especially BLOWN? 3. If sth wrong with my fuel injectors, why pull-starting can start my truck back up?
HOS:
Hours Of Service
HOS refers to the logbook hours of service regulations.