Replaced battery and starter both where bad. Truck

Try motor to body ground ? wiring harness connections..

sounds to me like you have a dead battery, a bad starter, or the elect. fuel pump in the tank has gone bad.

your battery terminals needs to be change over or you have bad cell in battery.

do your headlights come on bright.if not check your battery cables or all your fuses.if so could be fuse or starter sol.has burned out.

I’m happy to help further over the phone at https://www.6ya.com/expert/kenneth_3efc1f8510674f04

OK, I'd say you have a short, and a big one at that. Can you troubleshoot circuits? If yes, start at the engine compartment relay box and start checking fuses and any fusible links or circuit breakers in there.

Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

If you find a bad circuit, I can pull your wiring diagrams and tell you where to look for the short. Please remind me what the z71 means--this is a Sierra, right? Do you have dual batteries?

Sounds like a bad ground to the engine block.

1. disconnect battery 2.disconnect two wires on starter note one in selinoid 3.unscrew the two bolts i belive 15mm.

Could be a starter sticking but that would cause more of a grinding noise, my best guess is that your flex-plate(flywheel) is broken if the noise is coming from between the engine and transmission. Remove the access cover for the bell housing and take a look at the flex-plate.

does the starter make a "clicking noise" when it wont turn over? check your battery cables at the battery and at the starter solenoid....if it not a connection , then it sounds like a bad starter relay/solenoid

got bad starter or battery