2000 Dodge Ram 1500 with the 5.2 liter v-8 cranks but does not start. I have already replaced the asd and ignition coil and at this point I am getting power through the coil for about 1 second during cranking but then lose power to it I am receiving 12 volts when I do have power at the coil.

 

Sounds like the crank sensor

 

??? Asd relay gives power (12V) to the coil while cranking. If the ignition is on(without cranking) you will only have it for a short period. Is the battery fully charged?