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1988 Chevy S-10 voltage irregularity

Tiny
TPALM1975
  • MEMBER
  • 1988 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 16,000 MILES
I have a 1988 s-10 4x4 that when first started shows good voltage (around 15v)and brightly illuminated instrument panel and bright headlights. After driving a while and engine reaching normal operating temp the voltage drops (to around 10-12v) and lights go dim. I concluded since the voltage regulator is in the alternator that was the culpit. Changed alternator and it happened again within minutes. Most of the time, turn ignition off and restart and voltage is good again Any ideas?
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Saturday, December 12th, 2009 AT 6:52 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test IGN-GA fuse 20amp if okay check volt indicator and ignition switch


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Saturday, December 12th, 2009 AT 7:03 PM
Tiny
TPALM1975
  • MEMBER
  • 2 POSTS
Is there any possibility that it could be the ecm? Ive put a new alternator, o2 sensor, and map sensor
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Monday, December 14th, 2009 AT 6:10 PM

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