Ensure you have "ALL" the wires connected and a fully charged battery. Then use your remote to turn off the anti theft devises and your truck should start with no problems. You may have to switch the anti theft device from your old engine to your new one or take the vin of the new engine to the dealer and get the code for that engine.
SOURCE: how do you reset the anti theft system
Try disconnecting your battery cables then wait about 10 minutes. The computer should reset itself. Reconnect the wires to the battery. It is normal for the theft light to blink about every 5 seconds when the ignition key is out or in the off position. This means the system is armed and working properly. Hope this helps. God bless!
SOURCE: Ford F150 remote key does not work after car battery
Should not have happened,
For the Factory RKE ( Remote Keyless Entry ) have you tried reprogramming the key fobs to your truck. The procedure is in the owners manual ( need all of them at programming time ).
This is stored in NVR, and should not need to be done, but worth a try.
If this is an aftermarket Remote start / alarm, check the owners manual for t on battery replacement. Have seen some off brand with strange battery ( truck's battery that is ) replacement steps.
SOURCE: 1999 ford ranger. passive anti theft system wont
passive anti theft wont let me start my 1999 ranger ? how do Ifix it
SOURCE: i have a 2008 ford ranger xlt 4x4 4.0 truck. we
follow this steps and fix it. God bless you
Turn the vehicle on. The engine does not need to be running but the ignition should be on to power the stereo.
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Press and hold down the "Minute" button (located to the left
of the GM vehicle stereo's display. Some models require pressing and
holding the left arrow button if no "Minute" button is present.) Release
the button once the display shows "0000."
Press the "Minute" button (or left arrow) to set the value
of the third and fourth digits of the anti-theft code. Release the
button once the proper value for the last two digits is displayed.
Press the "Hour" button (or right arrow button) to set the
first and second digits of the code. Release the button once the
four-digit code is accurately displayed.
Press the "Mode" button to lock in the code you set. Turn
the stereo deck on by pressing the "Source" or "Power" button to
complete the reset.
Read more: http://www.ehow.com/how_6924001_reset-anti_theft-code-car-stereo.html#ixzz2gZHpH2aT
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