Do you think you could do a write up for the forum that walks people thru it step by step??? I'm sure a lot of members would be very grateful...
Here you go:
This should work using bulldog security keyless entry. From autozone it is Part Number: KE1702
If you read The installation manual:
and choose door locking "Type C" which is polarity reversing mode, and wire your door motor accordingly. (technically, wire this to the back of the switch that controls your door.)
Then you have to go to section 7 and look under "Programming 0.7 and 3.5 second door lock/unlock pulse time." Follow the directions to select 3.5 second mode.
It is important that you cut the wires as shown in the diagram.
If you follow the instructions correctly, the installation should not require any extra relays.Hopefully this is helpful.