1995 dodge ram 2500 will not start

Find yourself a copy of both wiring diagrams and overlay one on the other in effect. Working out whats missing. Is it that difficult to get the right harness? Given the age I'd have thought there were junk yard offerings?

Check the ignition switch it is probably faultu.

A test light connected across the coil primary leads should flash on + off when engine cranks(coil sparks when 12v turned OFF due to collapse of magnetic field).If you get pulsed 12 volts,and no spark from the coil,the coil is bad.If you don't get the pulsed 12 volts,trace back to find out why(the PCM turns the coil ground on and off,12 volts comes from switched IGN source)

very well could be i would check the pcm first.

P1D73 is active grille shutters

Could possibly be the ECM or computer it may be the crank sensor. The crank sensor is probably the cheepest so I would start there. Since it sound like you may be throwing parts at this, since you cant drive it to have a diagnostic done and you can't have the crank sensor tested, I would buy a used one from a junk yard to see if that is the problem to save a little money since you may have to buy somthing else if that does not work. Good luck

have you checked the crankshaft sensor? thats what gives it spark to the coil then to the plugs

the relay is only for the Overdrive.

The best thing I did when I bought my Ram van was to get on ebay and get a factory service manual. I got one for less than 10 bucks with shipping. Factory manual NOT haynes or Clymer.It'll show ya EVERYTHING a person needs.