Anonymous asked in Cars & TransportationMaintenance & Repairs · 2 months ago

Do car alternators have subpar performance in very hot weather and if so should I accept it or is there something that can be done about it?

I live in Phoenix and when its 110+F outside the alternators in all three of my cars produce marginal voltage... Autozone test shows "bad voltage regulator" in all three cars... but when I head up north to Flagstaff, to 80 something F weather, the same alternators produce normal voltage. 

Is this just what one can expect in very hot weather or should the alternators be replaced?

3 Answers

  • Anonymous
    2 months ago

    You are confused. 

    Are you trolling here?? 

    Autozone test? 

    I think that I see the problem. 

    Why dont you get a DC voltmeter and do your own testing?

  • arther
    Lv 5
    2 months ago

    if its happening on all 3 cars replace the mechanic for someone that knows what they are doing. 

  • Anonymous
    2 months ago

    I would love to see that Autozone tester.  NO tester will tell you a regulator is bad.  It will just tell you a voltage output when the alternator is subjected to a load. 

    Go to a real garage with real mechanics preferably ones that have a top of the line o-scope.  Check for voltage drops on the charging circuit first before condemning alternators.

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