starting

1997 CHEVROLET BLAZER
150,000 MILES
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TONYG129
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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
Oct 14, 2011 at 1:03 PM
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ASEMASTER6371
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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
Oct 14, 2011 at 1:39 PM
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TONYG129
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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
Oct 14, 2011 at 1:55 PM
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WRENCHTECH
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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.
Oct 14, 2011 at 2:15 PM
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ASEMASTER6371
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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
Oct 14, 2011 at 2:15 PM
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TONYG129
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What is the best way to look for and/or find a bad ground?
Oct 14, 2011 at 2:29 PM
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ASEMASTER6371
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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
Oct 14, 2011 at 2:39 PM
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WRENCHTECH
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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.
Oct 14, 2011 at 2:59 PM
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CADIEMAN
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test the voltage at the starter seloniod and for ingnition voltage on the small wire when starting.
Oct 14, 2011 at 3:15 PM