Engine not cranking no starter operation?

The key I have is like the picture on the right.

I have done the first task with no action. Also the clutch switch and my ignition switch are both brand new. I just added a ground on the 86 pin of the starter relay, that did not work either.

I went underneath the relay to tap in a ground. The connections there are not corroded. Also I do have 12v at the 30 pin and at the 85 pin I do not have voltage until I turn the key. And the voltage at the 85 pin is not 12v. Its not consistent but its lower voltage. I need to check the ground at the 86 pin. I have swapped the starter relay and the blower relay and the problem still persists.

At the 85 pin when the key is in and the clutch is in the voltage is 0.37volts. When I turn the key the voltage goes to 3.7 volts at the 85 pin. The 86 pin has continuity to ground.

Thank you so much. You are awesome. I appreciate your help with this. Now I need to find the source of the resistance.

Truck sometimes won't start. When we jump start, it takes a while before it can start. Happened again tonight. When I tried to start, it tried to start for about a second, then nothing, not even the lights, the clock, nothing. I took a while of charging with jumper cables before it would finally start. During the charging with jumper cables, the clock blinked rapidly. After a 15 min. Or so, all of a sudden, everything worked and it started up. Had Auto Zone check it with their little diagnostic tool and they said batt ok, alt ok, starter ok. Could this be a computer problem?

A clicking noise when the car is off, stops when trying to crank. Key turns literally nothing happens. Battery is charged, but the alternator looks brand new as well. Is there a way to use a multi-meter or something to test my alternator, without being able to start the vehicle?

Thanks for your reply! None of my lights will turn on, nor car crank over. I have a multi-meter though.

Have tested starter, starter relay and clutch safety switch, all tested okay. Vehicle will start if jumping starter relay with key on. Not sure how to test if ignition is the problem. Is there anything other than the ignition and what I have described to be the cause of this issue?

I have had my truck to be inspected for this problem but the mechanic couldn't make the problem happen so nothing got done. My truck's starter works fine when it is cold but when I leave a store too soon and try to start my truck, the starter doesn't do anything or make a noise. I have since learned to give the truck at least half an hour to cool down and then the starter will work. My battery was new Dec 2007 and it checks better than it is rated. I think it is heat that is making the starter not work. Is heat making something expand so much it is not making a good connection? Is it fixable or do I need to have the starter replaced?