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Engine not cranking over?

Tiny
STEVEN GRIBBINS
  • MEMBER
  • 1984 CHEVROLET VAN
  • 7.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 63,000 MILES
I bought a new Alternator because my battery wouldn't charge, so I bought a new isolator because it wouldn't charge the battery. It started just fine until I changed isolator now it will only start if I Jump large post of isolator to ground on Alternator bracket where I have isolator bolted to.
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Monday, February 12th, 2024 AT 4:31 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,539 POSTS
I don't know how the isolator is wired but here are the wiring diagrams for the alternator and starter, I would go back to basics and make sure the connections are correct. Here is a guide that may help as well, and I have included the wiring diagrams for the starter and alternator systems, one of them is a little hard to read but it is all they are giving us.

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

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Monday, February 12th, 2024 AT 9:39 AM

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