2004 Explorer remote start relay problem

Wow!  This is a cool site.  I wish that I had found it sooner.  Anyway, I installed a Viper 791XV in my parants explorer and I am having problems with the remote start relay pack.  The explorer will not crank, even with the key.  I show voltage on the relay packs green key side wire while turning the key, but the power does not go through the relay to the purple starter side wire.

I thought that I had a bad pack so I pulled the good pack out of my 04 Mustang, and tried it in the explorer.  At first the explorer would crank with the key, but after I tried to remote start it, the same problem re-appeared.  I think that I blew out both packs.  Although no blown fuses.  I have looked at the wiring digrams and I seem to have everything connected properly.  The two red fused wires are connected to the explorers yellow wire.  The green wire is connected to the red wire (ignition switch side), the purple wire is connected to the vehicle's red starter side wire, the orange wire is connected to the GREEN/ lt.green wire, and the pink wire is connected to the RED / green wire.  Anyone know what is happening?  Did I wire things correctly?

Any help would be greatly appreciated because they need the vehicle over the holiday weekend.   Thanks

Thanks for the responses.

I just tried a few more things.

If I unplug the small rainbow cord which comes from the main module to the relay pack the explorer will start.

I tried learning the tach and I was unsucessful.

I metered the uncommon coil wire (where I connected the tach wire), and there was no AC, but there was 14.4 volts DC.

Do I need to get the tach signal somewhere else like in the dash?

I still don't understand why the explorer will not start with the module cord plugged into the relay pack?????????  Does it have something to do with the anti-grind feature, since there is no learned tach signal yet?

Also;

What about connecting the tach wire to a fuel injector?  I did that on my Mustang and it works fine.

Is it better to get the tach signal somewhere else.  Thanks

Thanks for the replies.  I took the explorer to a shop and they found the problem.  The relay that I had installed to flash the headlights and honk the horn was back-feeding negative back into the orange ground when armed output, therefore causing the starter kill to activate.

This never occured to me because I am more familiar with the older systems which used a seperate starter kill relay.  I did not realize that the orange wire from the main harness was common with the negative wire inside the rainbow cord which activates the starter kill in the relay pack.

A simple diode solved the problem and now everything is working great.

Thanks again.