No Crank No Start Condition 2006 F-150

Tiny
BUSINESSFRED
  • MEMBER
  • 2006 FORD F-150
  • 5.4L
  • V8
  • AUTOMATIC
  • 215,000 MILES
I'm having a no crank no start problem with my F-150, at first it would only have trouble starting occasionally and would only start in neutral , it wasn't much of an issue but now the truck has been parked for a month or so and having starting problems.

As of now, I started by first replacing the starter, then the neutral switch that goes directly on the side of the transmission, and after neither of those fixed the no crank condition I replaced the ignition switch.

The only way to get the truck to crank at all is jumping directly at the relay port. But it still won't start possibly due to the PATS system.

I am requesting some diagnostic steps or anything that would help me to resolve this issue. Thank you
Monday, August 4th, 2025 AT 9:13 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
The the PATS system wont make it not crank over, to me it sounds like the starter relay needs to be replaced. Here is the location of the relay so you can swap it out and the wiring diagrams of the starter circuit so you can see how the system works. Check out the images (below). Let us know how it goes.
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Tuesday, August 5th, 2025 AT 9:54 AM
Tiny
BUSINESSFRED
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  • 91 POSTS
I replaced the relay and there is no change . Any other suggestions?
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Tuesday, August 5th, 2025 AT 12:04 PM
Tiny
KEN L
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  • 54,137 POSTS
Yes I would check the fuses F102 and f103, if they are good here is a guide on how use a test light which can help you find where you are losing power. Also this video can help.

https://www.youtube.com/watch?v=6YRW8fyNudY&pp=0gcJCa0JAYcqIYzv

Please go over this guide and get back to us.
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Tuesday, August 5th, 2025 AT 12:48 PM
Tiny
BUSINESSFRED
  • MEMBER
  • 91 POSTS
The 2 fuses are good
Any other suggestions?
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Monday, August 11th, 2025 AT 9:20 AM
Tiny
KEN L
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Okay, do the fuses have power to them when the key is in the crank position?
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Monday, August 11th, 2025 AT 12:37 PM
Tiny
BUSINESSFRED
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  • 91 POSTS
Yes they both have consistent power both on & crank position
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Wednesday, August 27th, 2025 AT 2:48 PM
Tiny
KEN L
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  • 54,137 POSTS
In the crank position are you getting power to the Yel/ltblu wire at the starter?
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Friday, August 29th, 2025 AT 11:26 AM
Tiny
BUSINESSFRED
  • MEMBER
  • 91 POSTS
I didnt see any colored wires at the starter just the main red and black wires, did you mean coming out of the back of the fuse box?
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Sunday, September 7th, 2025 AT 6:55 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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No I meant down at the starer motor. Here is the wiring diagram. You need to check for power when the key is in the crank position.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Let us know how it goes
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Monday, September 8th, 2025 AT 10:51 AM

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