so i was driving and it just died no spark .. long story short the motor was on its way out anyway so i swapped the motor .. along with a new along with a new coil a new cps new plugs cap rotor timed the motor new dist and ecu tested juice when cranked only 3 volts hooked up directly to the batt started right up then shut down what could it be im stumped

 

Can you please reword that in standard English? I'd be glad to help if I could figure out what you were trying to say.

 

Truck wont start has a new coil plugs rotor dist ecu cps i hooked the coil directly to the batt amd it started up when the coils plugged to the harmess it only reads 3 volts

 

This happened to me, and it turned out to be fused link.

 

So your Jeep won't start and your battery only reads 3V? Uhhh... Your battery is dead...

 

With the description, that's the conclusion I gather as well.

 

I think he is saying that he hotwired it straight from the battery and it starts. But he only gets 3 volts when he reads the harness

 

There is high resistance somewhere: connector, wiring, ignition switch. It doesn't have a ballast resistor for the ignition does it? Check the connector at the ignition switch see if it's fried. Breakout your DMM and get to work.