Installed new batteries , CAT diesel won't fire at all ??

seahunter 1.....I know how frustrating it is when you do a simple task and it messes up something else. "hershey" was correct when he stated you may have put the cables on wrong or missed a smaller diameter cable that sends power to the ECM.

My brother in law pulled his batteries out the other day and had a similar issue and had a no start situation on a Cat. Double check the cables and look for a smaller one that may have been left off.