I put a new starter, delco remey 39MT, into my cummins ISX about 3 months, had no issues with it, until today.
Today I started the truck, it started fine, didn't struggle at all, I drove 8 miles and stopped to it to get some breakfast, when I tried to restart it all I get is one click at the starter.
My old starter would do this sometimes, but would always crank on the second try, I ended up replacing this starter as it would slow crank without enough power to start it. But as soon as the new starter went in it started fine.
I spoke to the driver, he said since the new starter has gone in, it did the one click thing once before, but started second time.
I have checked batteries, checked grounds, checked voltage at starter etc
What are the chances the new starter is no good? I doubt it is that, would there be a relay or something somewhere? Any advice would be appreciated.