2000 Dodge Intrepid Engine won't crank (or start)

Engine won't crank or start. When I remove the ignition relay, in the power control box under the hood, and jump from the power in terminal to the (normally open) out put terminal that goes to the starter solenoid, the engine cranks but will not start even with the key turned on. With a 12 volt test light I have voltage coming from the ignition switch (when turned to the crank position) at the proper input terminal (control circuit) of the afore mentioned ignition relay, so I know the the ignition switch is not at fault. I am surmizing that something in the control circuit (ground side) of the ignition relay is where the problem is. I have swapped the ignition relay with a functioning relay (same part number) from the wiper relay circuit but this makes no difference. There are no codes stored in the computer. I believe that the neutral/park switch is in this circuit But I don't know how to isolate/ bypass this to see if this is the problem Where should I look from here? Thank you in advance for any help that you can provide.