Will not crank

Tiny
BUCKSISK
  • MEMBER
  • 1985 CHEVROLET SILVERADO
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Okay, I installed a new battery and alternator now 3 days later the truck fired up drove 20 minutes down the road and now it won’t start back up.
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Monday, December 2nd, 2019 AT 6:20 AM

4 Replies

Tiny
JONNYB1963
  • EXPERT
That does not sounds like very much fun over the holiday weekend!

Okay, first I need to get some more information from you to help us get to the bottom of this sooner.

From what I read here, you replaced the battery and the alternator. From there you drove for 20 minutes and the car would no longer crank. Is that correct?

Will it start with a jump? Or does it just crank and wont start?

Sorry for the questions but it is important to decide which direction to head.

Regards,
Jon
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Monday, December 2nd, 2019 AT 7:20 AM
Tiny
BUCKSISK
  • MEMBER
Yes drove 20 minutes and wouldn t crank up! Let the truck sit 8 hours and truck fired up drove back home 20 minutes and wouldn t crank back until I hooked jumper cables to it and fired right off.
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Tuesday, December 3rd, 2019 AT 7:00 AM
Tiny
KEN
  • ADMIN
It sounds like an ignition problem when the engine wont run. lets check for spark. here is a guide:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please run down these guides and report back.
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Thursday, December 5th, 2019 AT 11:08 AM
Tiny
JONNYB1963
  • EXPERT
Thanks for the response, and so sorry I didn't get back to you very fast.

To me it sounds like something is heating up and when warm has a lot of resistance.

Could be:
High resistance in the battery cable or starter cable
Starter motor is weak and has high resistance when hot from the engine running
Poor connection that gets aggravated when warm (because things expand when hot)
etc.

To really find out whats going on. We'd need to do some testing.

Do you have access to a multi-meter (to measure the battery voltage) and a Clamp-on Meter that will measure current?

What we need to do is measure the battery voltage and current while you are cranking the engine over when its cold, and then repeat the same test once you've driven the car for 20 minutes. You may need a friend to help you with that one so you can watch the meters while your friend turns the key.

Would you be able to do that?
Jon
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Friday, December 6th, 2019 AT 5:24 AM

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