altenator without a tester

2000 KIA SPORTAGE
74,445 MILES • 4 CYL • 2WD • AUTOMATIC
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JUNIOR64
  • MEMBER
  • 43 POSTS
I would like to know to test an altenator without a tester which cable i have to disconnect positive or negative
Sep 12, 2011 at 10:31 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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MHPAUTOS
  • CAR REPAIR CONTRIBUTOR
  • 31,937 POSTS
Do not do this, you run the chance of doing serious damage to the ECU as disconnecting the alternator with the engine running can induce a voltage spike that can destroy delicate electrical equipment, only use correct testing equipment.
Sep 12, 2011 at 10:53 PM
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SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
Just to add to this i agree buy your self a multimeter you can get them for 10 or less.Have the battery tested first if its bad replace it then make sure your battery cables are clean and tight.Then start the car up see what the voltage at the battery is then turn on the headlights ac etc and see what the voltage is let us know what you find.
Sep 12, 2011 at 11:04 PM