No start problem

1990 GMC SIERRA
77 MILES • V8 • 4WD • AUTOMATIC
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JHAYES
  • MEMBER
  • 1 POST
my 1990 GMC Sierra 4x4 pickup is having starting problems. I checked the battery, it reads 12.0 volts. on my tester. I replaced the starter 1 month ago. When I try to crank it over, I can hear the starter trying to turn the flywheel. but nothing happens. Do you think neutral safety switch or poss. bad alternator?
Jun 4, 2011 at 7:24 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
12.6 volts is the generic spec for a fully charged battery. Using a digital multimeter, leads across battery posts, have helper turn key to crank, how far does the voltage reading drop? It shouldn't drop below 9 or 10 volts. If it drops to zero, get the battery charged and check connections.
Jun 4, 2011 at 8:37 AM
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