Changed computor wont start - 1999 Dodge Ram

You need to get it connected to merc star computor to narrow the problem down it could be many things you wont get a difinitive answer here

If I'm deciphering this correctly, sounds like someone changed the ECM/PCM (Computor) out at some point with a rebuilt or boneyard special. Here's the fun part- if so- then you will need to take the car to the dealer and have them "scrub" the computer and reload it with the correct info for your remote.

There a 2 coolant temp sensors. One for the guage and the other for the computor. You need to replace the one for the computor. With a faulty coolant temp sensor for the computor, it doesn't recognize a cold start to cycle. You know when the engine idles higher when you first start it up in moring then the idle drops as the motor warms up.

Have the coolant sensor checked, at the right temperature it sends a signal to the computor to turn the fans on.

I had the same problem. I changed the computor, the key switch, the box in the trunk and nothing helped. I traced wires looking for loose connections and found nothing. I did notice that the yellow wire goes to the instrument cluster before going to the computor. All of these parts came from a junkyard so I changed them 2 times each and had the same thing. As a last resort I asked for an instrument cluster. He looked at me like I was crazy. After I changed it it immediately fixed the problem. You have change the odometer from the bad one to the good one. It is easy to change.

Does it not even try? Or does it start and then stall after about 2 seconds?

There's only 2 more things that I can think of, check the fuse for the ignition, then the computor itself, you did everything else.It might be the problem and may not.

Check to make sure the Security light in dash on right hand corner is not on. If it is on , your passlock is enabled. to dissable it turn your key on but not start it and wait for apx 10-15 minutes. this should re-set it.

YOY MUST GET THE COMPUTOR SCANNED FOR FAULT CODES,COULD BE CRANK ANGLE SENSOR