Battery is good, when I turn the key ebery thing comes on, but seems like no power to the starter, I jumped the starter and it is fine. also I changed the starter switch assambley, still same issue. WTF do I do next??

 

Did you try cleaning the terminals/cables? Are ground connections clean and tight? How do you know the battery is good, has it been load tested? If all that's good, you either have high resistance in the battery/starter cables or the park/neutral safety switch may be malfunctioning.

 

battery is good , from time to time it starts as it should, but 90% of the time it acts as decribed

 

could it be a bad neutral safety switch?

 

solenoid bad on the starter? or the relay

 

checked relay it is good, solenoid should be good the starter is only a year old but is there a way to check that?

 

Swap the starter relay with another one. See if the problem goes away.

When it won't start, are you getting 9 volts (at least) at the small wire on the starter solenoid?

All connections clean and tight?

 

connections are good, battery, and starter are less than a year old, relay has been swapped for new one, haven't checked small wire for 9V yet, ign key switch has be changed, still no start,

 

See if you are getting power at the starter solenoid then. Take it from there.

Any variety of aftermarket alarm on the truck?