Question about 1994 Mercury Cougar

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Is there a regulator that will make a brand new altenator not work?

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The regulator is within the alternator body.

What are your symptoms?

Have you checked the charge at the vehicle battery?

Have you checked the condition of the vehicle's wiring between the alternator and battery?

Posted on Nov 04, 2012

  • 1 more comment 
  • jdrocket66
    jdrocket66 Nov 04, 2012

    the battery wont charge after replacing both battery and altenator, tested by autoclub and result says altenator isn't giving the battery any charge

  • Jamie Alton
    Jamie Alton Nov 04, 2012

    The alternator gets an input on the terminal L of its voltage regulator. When terminal L gets positive battery voltage, the alternator can charge the battery and supply power to the accessories as needed. When the voltage at L is low, the alternator is turned off, and no power is supplied even if the system voltage is low. Terminal L is connected to an output from the PCM (computer). The input to L is called the exciter wire for the voltage regulator.

  • Jamie Alton
    Jamie Alton Nov 04, 2012

    If you have a poor signal to the L terminal, then try running a wire from the fuse box to this terminal, but make sure it's only powered with the ignition on. Then also check for any parasitic current drain once this has been achieved.



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well for starters your altenator is bad because what it is dolinging is over charging the battery hence why it boiled off the water/acid in the battery. the regulater is intergrated into the altenator. there is not a short because numberone your car would not start and two your battery would explode. i never test a battery or altenator at a store like napa or Oreilly's because they are not mechanics ......they are parts guys. your altenator should charge the battery at no more than 14 volts and the average is 13.5 volts. you need to replace the altenator the reason why you are losing a charge is be cause as the car is running the battery is being discharged because the regulator is defective in the altenator. please rate this thanks

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