will not turn over

[98blownranger]

2000 f250 7.3
both batteries were tested and are ok
started was tested and ok
started relay was replaced

all was done at autozone.

turn the key and nothing happens, the voltmeter shows power at the starter and it being turned on with the key also. it seem to have volts but maybe no AMPS??? I am at a loss here.
this happened after replacing the GPR and AIH relay.

is the a link inline? anthing else I am missing I thought I did everything
I looked at the 50amp fuses and they look good and I also swaped them around

[98blownranger]

bump anyone??

[Jmaccal]

I had my batteries tested at Autozone but they had the tester turned down to test car batteries. Both tested good, when I was telling the guy one is bad someone else came over and adjusted the machine, one was dead. Bought new one and all went well.

[98blownranger]

they replaced one battery due to it being bad, both batteries were new in spring, now I have a new a 6month old battery