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Tiny
TONYG129
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 150,000 MILES
I have replaced my battery alternator and starter. I have checked all my wires for draws and shorts and found nothing yet my truck still wont start. When I hook jumper cables up it starts almost instantly. Any ideas? Could it be an ignition switch? How could I test that? Im going crazy
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Friday, October 14th, 2011 AT 1:03 PM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, not the switch as it starts when you jump it. It has a lack of power from a supply source.

I would start over with a battery test first. Then do a parasitic draw test to see if there is a draw on the battery.

Roy
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Friday, October 14th, 2011 AT 1:39 PM
Tiny
TONYG129
  • MEMBER
  • 15 POSTS
I have had the battery tested and have done a draw test. Both were fine. The battery tests at 12 volts constantly but will not start it be
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Friday, October 14th, 2011 AT 1:55 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You need to do your testing over again. There is no question that you are not receiving sufficient [power from the battery for whatever reason which could be bad battery, parasitic draw or poor connection. It's one of those 3 things.
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Friday, October 14th, 2011 AT 2:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Ok, then I would be persuing grounds. If you have any kind of a bad ground, it will starve the vehicle of needed power.

Roy
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Friday, October 14th, 2011 AT 2:15 PM
Tiny
TONYG129
  • MEMBER
  • 15 POSTS
What is the best way to look for and/or find a bad ground?
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Friday, October 14th, 2011 AT 2:29 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Checking for voltage drop with a volt meter. If you are not sure, take it to a shop and let them do the test for you.
Roy
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Friday, October 14th, 2011 AT 2:39 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If putting a set of jumper cables on the car resolves the issue, then you are not looking for a bad ground. Your problem is right at the battery.
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Friday, October 14th, 2011 AT 2:59 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Test the voltage at the starter seloniod and for ingnition voltage on the small wire when starting.
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Friday, October 14th, 2011 AT 3:15 PM

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