truck will not crank

[pistolpete837]

04 6.0 with 78k miles. batteries are charged, when i turn the key to fire it up there is nothing. not click no nothing. cables are tight on the batteries. what should i try next?

[bigcountrysg]

Try the starter. I would remove it and bench test it to see if it is working. If it is, then I would check the ignition switch.

[Diesel_Diagnostician]

I'd check for power at the starter first, i'd sure be mighty upset if I pulled out the starter to bench test it and it was the power wire to the starter - Terminals could be greened out.