Will not crank

100,000 MILES • 4.9L • V8 • 2WD • AUTOMATIC
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WHIPLASH46
  • MEMBER
  • 2 POSTS
Battery new. jump starter at starter, cranks turn key on gauges have power. turn key to start gauges peg out but nothing.
Aug 2, 2017 at 1:47 PM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,407 POSTS
Does "but nothing" mean the starter does not crank the engine? If so, what happens to the brightness of the head lights or interior lights when you try to crank the engine? Have you tried it in neutral? Can you hear if the starter relay clicks?

If you have a test light, we can do all the testing at the socket for the starter relay.
Aug 2, 2017 at 2:59 PM
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WHIPLASH46
  • MEMBER
  • 2 POSTS
if I take screw driver at starter jump it will turn engine. turn key to start all gauges go up to max but nothing happens.
Aug 2, 2017 at 8:00 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,594 POSTS
Hello,

It sounds like you have a neutral safety switch that has gone out. Here is a guide and some diagrams to help you confirm the problem and get the truck fixed.

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

and

https://www.2carpros.com/articles/how-a-neutral-safety-switch-works

Check the diagram (below)

Please let us know what happens.

Cheers, Ken
Aug 3, 2017 at 8:19 AM
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