LMM: Click, No Start (Another One)

[camper93]

So I have been having this issue for about a year now, thought it was batteries so I bought 2 new AC Delco batteries rated for my truck last year. All was good for a while and then started acting up again, took the truck to a GM dealer and after diagnostic they said it was the starter, so they replaced it about a month ago. Out shopping a couple of days ago the same thing happened, click but no start, got a boost and it started, went to the garage and had the batteries tested and all is good. I have checked the cables including the junction box on the fire wall and all seem fine (no corrosion). I have tested the alternator with my volt meter(14.6 volts when running). Any ideas would be greatly appreciated.
Thank you in advance.Ed

[lmm2tow]

Have you checked the grounds? While I am new to the LMM world why past experiences always seem to point to a bad ground in these cases. Seems you should have a ground from each battery to the block.

[camper93]

All the ground cables are clean and tight.

[heymccall]

I seem to recall a rash of poorly crimped battery cables on the '07.5s and '08s. Thorough inspection of where the cables are crimped into the battery lugs is in order.

[camper93]

Ill have a look
Thanks