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all lighting strobing/flashing 200

posted by  someone claiming to be Danny Mac on  Tue Oct 26 14:44 CST 2010 [RELATED]

I recently had this exact problem on our Isuzu Axiom. The dash lights, map lights & headlights would pulsate at idle about 750 rpm. Above 1000 rpm it would even out & go away. I had the alternator tested at Oreilly Auto Parts during daytime. Battery, alternator field diodes & regulator all checked okay. Alternator output was about 14.4 v. Then I turned on all headlights, fan, ac, rear window deice and radio to put full load on the system. The output started fluctuating between 13.2 to 13.5 v immediately, telling me the regulator was going bad. I replaced the alternator & all is well.
Even though your alternator is fairly new you might want to test it. There are a lot of bad ones being sold!
Sorry for the long post... hope this helps!

Good Luck!






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