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.
Monday, February 12th, 2024 AT 4:31 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 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

Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.
Images (Click to make bigger)
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Monday, February 12th, 2024 AT 9:39 AM

Please login or register to post a reply.

Related Engine Not Cranking Over Content

Car Not Cranking? Try This | EASY
VIDEO
Car Not Cranking? Try This | EASY
Instructional repair video
Starter Not Working
GUIDE
Starter Not Working
This guide is designed to help you identify whether the issue with your non-working starter motor is due to an electrical problem or a fault within the starter motor itself...
VIEW MORE