The starter motor requires high electric current to turn over the engine, whereas lights and wipers take very little current to operate – so don’t rule out weak battery even if electrical accessories work normally in your Mountaineer.
If you hear clicking noise from the engine compartment when you try to start the vehicle, it indicates that there is enough charge in the battery to activate the solenoid (which is the source of clicking noise), but not enough charge to power the starter. This can happen if the alternator isn’t charging the battery properly. The leading cause of clicking noise and no start in Mercury Mountaineer is weak battery. Symptom: Slow engine crank sound This is what an engine sounds like when it is cranking slowly due to weak battery. Slow crank is usually the first symptom of a dying battery. If the alternator isn’t charging the battery properly, the engine may crank very slowly and may not start.
It powers the starter motor that turns over the engine. The 12 volt battery is a vital component of the starting system in Mercury Mountaineer. When the battery charge gets too low the engine will shut down, and you will be stranded. The battery charge will go down as you drive since all the on-board electronic controllers and accessories are now solely powered by the battery. Yes, you can drive your Mountaineer with a bad alternator, but only for a short distance. Can you drive Mountaineer with a bad alternator? If you see numbers between 13.5 volts and 14.8 volts with no major fluctuations when you turn on the accessories in the vehicle, the alternator is functioning properly. If the voltage drops below 12 volts with the engine running and the accessories turned on, it means the current supply from the alternator is completely cut off and all the electronics are solely powered by the battery.If it drops and remain below 13.5 volts, it indicates a problem with the current supply from the alternator. The voltage should remain around 14 volts.
Mercury mountaineer full#
Switch on the accessories in your Mountaineer, for example, headlights, AC fan at full speed, and interior lights.The voltage should be between 13.5 and 14.8 volts with the engine running.Connect the black cable of the multimeter to negative terminal of the battery, and the red cable to the positive terminal.The easiest method to check the alternator is by measuring the voltage at the battery terminals when the engine is running. Before replacing the alternator, you must rule out other causes that may stop or degrade flow of current from the alternator, for example: bad electrical connection or damaged wire. Alternators can fail at any time, but generally they last over 100,000 miles.
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