No crank, no start, battery is fully charged?

Tiny
TERRY JOOS
  • MEMBER
  • 2000 BUICK LESABRE
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 96,000 MILES
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.
Monday, April 14th, 2025 AT 11:11 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 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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Monday, April 14th, 2025 AT 1:17 PM

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