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Yes, check the connections at the batteries, the main earths to the engine and body and the connections at the back of the alternator.
Does the vehicle still start now? have you noticed your lights brightness changing?
Without a voltmeter it is a bit hard to test.
It could be a faulty dash gauge, alternator or vehicle wiring faulty.
Does the battery/alternator warning light in the dash work correctly?
With the hard starting you will need to check your glow plug circuit. First make sure the busbar that links the glow plugs gets power, then make sure each glow plug has continuity.
Have you swamped the vehicle recently? had water inside the cab?
A multimeter will be very helpful in diagnosing these problems.
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