Question about 2007 Mercury Milan V6 AWD Sedan
Posted by Anonymous on
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Posted on Jan 02, 2017
Sounds like you have a typical case of loose fan/alternator belt or bad alternator.
If the belt is not tight enough with the engine idling the engine cant turn the belt fast enough on the alternators pulley, thus causing a low volts output from the charging terminal of the alternator, and this can cause all the funk you are describing. Put a test on the charging system, at least a 12volt DC digital hand held voltmeter across the battery terminals set it to 20 volts DC and let the car idle...if the voltage drops to 12.5 volts or less the belt may be loose or the alternator may be defective.
To check the alternator belt, shut off the engine and remove the key from the ignition to avoid an accident, try turning the alternator pulley if it turns by hand without turning the fan belt, its too loose, also if you can't reach the pulley, check the belt for too much slack, with it running and lights on etc. look at the belt as it turns(dont touch!!) does it appear to be jumping? this would indicate it is too loose, tighten it with proper ratchet and socket size, and pry 16" bar and try volt testing again, the meter charge rate should read 13.5-14.5 volts idling with all lights on etc., if not then the alternator is the culprit.
Never attempt changing any electrical part like an alternator, starter motor, etc without first disconnecting the battery the alternator should come off with the removal of two mounting bolts, one thru bolt may be 5/8" hex or its metric counterpart 15mm hex at the alternators base(sometimes refered to as the "pivot" bolt) approx. 6" long, one belt adjuster bolt, either 1/2" or 9/16" or its metric counterpart 13 or 14 mm, one electrical plug easy clip pull type, and the out put wire has one nut either 3/3" or 7/16 " hex or its metric counterpart of #10 mm.
Be sure to clean the battery terminals using a baking soda mix and be wearing your eye protective googles.
Reinstall using the reverse proceedures and walla, you are back in business.
You may have to charge the battery before putting the vehicle back into service, and me as a ruke, i generally don't keep a battery longer then 5 years old, but that is just my theory, I don't want to get stuck during a road trip or bad weather or both having a battery problem because they erupt without notice at times.
Posted on Jun 09, 2010
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