No start problem

Tiny
JHAYES
  • MEMBER
  • 1990 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 77 MILES
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?
Saturday, June 4th, 2011 AT 2:24 PM

1 Reply

Tiny
JDL
  • 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.
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Saturday, June 4th, 2011 AT 3:37 PM

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