Slow cranking 1HZ when cold (1 Viewer)

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Joined
Mar 5, 2014
Threads
55
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Location
Easley, SC
Not ambient temp cold; when the truck is dead cold, the HZJ77 slow cranks on the first try of the day. After that, all subsequent starts are normal.

* new glow plug relay from when I put a new head on the motor. Glow plug system checks out.
* Batteries have tested as fine.
* It has a new alternator that I put in a few months ago. Charging system working great.
* I thought it was the old starter as it’s an old aftermarket unit. Replaced it last night with a new 24v from cruiser outfitters.
* I noticed the hot lead coming from the batteries to starter has some green on the copper; I’m guessing this may be part of the issue, but wanted to see if anyone has had this issue.

It cranks slow, pauses, then turns over fine and starts everytime, but it’s only on the first crank of the day when it’s a cold engine. Thoughts here?
 

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