Why won't my truck even crank with a new battery and new ground terminal.

85 & 86 are the control side of the relay , one should have battery voltage (85) the other (86) doesn't .86 is control from the PCM - engine computer . PCM supplys a ground to close contacts inside the relay sending battery voltage to the S terminal on the starter solenoid . If the PCM doesn't see a voltage signal fron the park neutral safety switch it won't energize the relay .
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.

I saw this link and it has same issue with several solutions.
Some solution check motor ground, damage wiring to distributor/ coil, ecm and crank sensor. One person said he found solution by trouble code even though he had no check engine light on dash.
https://www.cargurus.com/Cars/Discussion-t22082_ds552596

If you're jumping with the jumper neg lead on engine block (like you should) then you have a bad ground lead.
If you are jumpering to the battery terminals then the connection to the battery itself is bad. Clean the battery connector terminals.

if it wont turn over 1st check the ground s on the car and the battery 1st. your battery can be fully charged and the car will not start even over night this can happen. then look at the starter. Note: if you have over 109K on the car and the timing belt has never been replaced you will need to have this checked as well.

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This is the classic symptom of a bad battery. Your engine requires a lot of power to crank but the little lights in your dash require very little. if the battery is even a little drained it won't crank the engine, but everything else will seem to work fine. Either jumpstart the car (if it starts, then you likely need a new battery) or test the voltage at the battery terminal when trying to start the car. If the voltage drops below 12 volts you need a new battery (or at least a freshly charged one)

well if you have a dvom/voltmeter check the power at the starter terminals. the main terminal should have power all the time the key wire should have power only when the key is turned to crank engine. if you have power at both then i would start looking at grounds

clean the battery cable terminals and battery posts till it show's bright metal , put some grease on the posts and tighten the terminals.

your battery is probably junk. remove it and take it to your auto parts store and have it tested.

Sounds like a classic ground problem for sure.
Make sure the battery terminals are really clean,try vinigar to clean them.
Bet it starts,if not check the solinoid somewhere mounted on the fender or firewall.

there is a relay that controls the spark and fuel. its sometime by the battery or under the dash right of the glove box. two relays in one pack you can replace both with seperate ones good luck i got stumped on one like that