will not crank

[Hulsman]

HELP!!!!!
i have a 97 6.5, replaced the starter with a used one, was cranking over but no start, now will not crank over now. I have 2 1000cca batteries in it. turn key wait for glow plugs then it just clicks. connections are good as i am a heavy duty mechanic but i still have not got my head around these 6.5L.

any help will be awsome. would love to have this truck on the road again

[a5150nut]

Are your batteries up to full charge?
Computer has to see 100 rpm cranking before it will give any fuel.

[Dvldog8793]

Howdy
My next suspicion would be the used starter. As stated, it needs to get up to RPM before the computer will start it.
Was the initial problem a broken starter?

[Yukon6.2]

Test the batteries as well.If you have a bad battery it will drag your good battery in the gutter,just like an alcoholic.
Then double check your starter as mentioned.