Immobilizer light will not turn off after changing the engine

2007 FORD RANGER
190,000 MILES • 3.0L • 6 CYL • 2WD • MANUAL
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KYLEZZZ
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Hello, I need help. I changed the engine in my truck and tried starting it, but when I turn the a relay fuse clicks really loud and the immobilizer light constantly flashes. the truck wont crank.
Sep 22, 2019 at 5:31 PM
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DANNY L
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Hello, I'm Danny.

Let's try a security system/anti-theft reset first.Here is the tutorial showing what is involved:

https://www.2carpros.com/articles/how-to-reset-a-security-system

After reading scroll down the page to find Ford.Hope this helps and thanks for using 2CarPros.

Danny-
Sep 22, 2019 at 6:18 PM
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KYLEZZZ
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So I had a guy come program a key and try to remove the immobilizer lock and he said he could get into the cluster settings or something like that and said the relay in the engine bay keeps clicking in the on position. I still can't start the truck.
Sep 24, 2019 at 5:40 AM
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STRAILER
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Did the security light stop flashing? If so lets check to see if the starter is getting a signal. This guide should help:

https://www.2carpros.com/articles/starter-not-working-repair

Please run down this guide and report back.
Sep 27, 2019 at 5:18 PM