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Upgraded contacts for the expensive DENSO starter for Cummins trucks are a DIY job . . but that starter is also heavy and hard to remove (compared to, say, a V8-350 Chevrolet). At 200k I might do mine.
I agree that electronic engine control, better batteries and pemanent magnet starter motors have made life easier for this electrical subsystem. To the above I would add wirebrushing the starter mount flanges and -- on those plus on cable terminations -- one use NOALOX or similar to eliminate corrosion and improve conductivity.
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