No crank, no start, battery is fully charged?

2000 BUICK LESABRE
96,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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TERRY JOOS
  • MEMBER
  • 1 POST
No crank, no start.
Checked and made sure the battery was fully charged. Cleaned and tightened battery connections everything was good. Tried starting in park and neutral. No start no crank. Jumped relay engine cranks. Will not start with switch. Checked all fuses front and rear fuses boxes. Checked start relay, works and making connection. Voltage at relay, voltage on relay when using start switch. Cleaned ground points on transmission on and ICM, cleaned ground point on alternator.
Apr 14, 2025 at 11:11 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,180 POSTS
Is sounds like the ignition switch might be bad, let's check for power at the yellow wire from the ignition switch while the key is in the crank position. This guide can help, and I included the starter wiring diagrams so you can see how the starter system works.

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

Check out this video as well:

https://www.youtube.com/watch?v=6YRW8fyNudY

Check out the images (below). Let us know how it goes.
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Apr 14, 2025 at 1:17 PM
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