Question about 1999 Mercury Cougar

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Alternator will not charge ,has new alt - 1999 Mercury Cougar

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  • Ned C Cook
    Ned C Cook May 11, 2010

    All the wires hooked up?

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If your car is equipped with one, have the external voltage regulator, or regulator module checked, usually mounted on the inner fender well on passenger side.
Even with a new alternator, if the regulator is bad, it will not charge.

Posted on Jul 26, 2009

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1999 3.2l. Why are battery and brake lights on?


was not on before the new alt,? is alt new or used.?
or came on only after the new ALT?????????
my guess, is 2 failures.! (one ignored and 2nd grew)
on with engine running, guess yes.
Good question and is same answer on all cars.
1: engine rpm too low, what is yours (below 80 rpm)
2: fan belt slips. bad tension pulley (weak and old???)
3: Alt bad, or its wires bad.
4: brake level low, (@MC) or hand brake switch stuck on, or other brake failures. a plenty, scan the PCM and ABS if you have ABS.
id not drive it with the brake lamp on (Savvy?)
the battery light is really the ALT charge lamp.
it glows anytime the Charge system can not charge the battery
if you drive far like that, the engine will stall and not crank.

5: the horn fuse power the alternator, so check the horn fuse
10amp , key on, 12vdc on both sides of fuse is needed/
fyi: the meter fuse runs the charge lamp, if said lamp is dead bingo.
6: fact 2, the PCM does NOT run the Alternator on the 3.2L .
7: alternator case not grounded right.
8: battery is bad, causing alternator to drop off line
9: battery cables bad, at the 4ends or they are bad.
10: the plug on the rear of alt is bad or its wires or pins rusty.


brakes:
the brake lamp has 3 inputs ("OR" logic) master cylinder level low.
the hand brake lever and the EBCM (electronic brake control module)
a technician unplugs each to see what causes the error.
if you unplug mC wire and hand brake wire
then the EBCM is UNHAPPY, scan it.

Jul 31, 2015 | Isuzu Rodeo Cars & Trucks

1 Answer

I have a 1984 ford e-150..new battery...alternator tested good 2 times...new v


if you trace the main wire from alt to battery and still no charge,then you need a new alternator,it will not charge under load

Apr 28, 2015 | Ford Cars & Trucks

1 Answer

Alternator not charging


is it charging at 14.9 ? 14. any thing is at 1000rpms ( no lights or radio etc working) 13.23 to 13.86 volt is good enough to charge battery. what is the charge rate.

Jan 30, 2014 | Acura CL Cars & Trucks

1 Answer

Case backhoe 580sk not charging no power to field circuit on alternator


You mentioned "alternator warning light" if that alt, battery light does not come on when the key is turned to the "on, acc." position the light bulb is bad or the traces leading to that light bulb on the back of the instrument cluster has a break in it. I know this sounds crazy but if that light bulb does not light it does not complete the circuit for the alt to charge!

Jan 11, 2014 | Cars & Trucks

1 Answer

ALTERNATOR wont charge


What is the idle speed? Are you sure the belt is routed correctly?

Apr 26, 2013 | 1993 Mazda MX-3

1 Answer

Changed the battery and the alternator still no charge voltage runs at 11.5 for about five mins then drops to 9.4


That means the alternator is bad and needs to be replaced. The alternator charges the battery up to about 13.7 vdc. But check the wiring on the alt. first. There is a large wire that hooks to the alt. That wire should have the same voltage as the battery does. If that wire is right you need a new alt.

Mar 10, 2011 | 1990 Eagle Talon

2 Answers

Can a bad alternator cuase a car not to turn over even with a new battery


no if you have a good batt you don't need alt the alt charges batt after you start the car

Jan 21, 2010 | 1991 Dodge Stealth

1 Answer

New alternator didn't charge battery. (2VDC


As the car re-started, the battery is not flat.
The voltages measured indicate a problem with either the power or ground connection in the circuit between the alternator and the battery.

You likely have a intermittent / poor ground connection somewhere in the power system.
Check battery terminals are clean and firmly attached.
Check battery cable and alternator ground connections are intact and in good order.

Oct 29, 2009 | 1999 Chevrolet Cavalier

1 Answer

Alternator problem


the easy way to check if the alt. give charging is by using a metal then touch the alt. body if the alt. has produce magnet meaning its charging. Or to verify it is by DMM measure the voltage in batt. term. it should be 14v.

Jun 14, 2009 | 2004 Volkswagen Eurovan

2 Answers

Changed alternator in 2000 mpv battery comes on and off


Check the large fusible link labeled ALT in the under hood fuse box. If this fuse gets blown, the alternator wont be able to charge even if it IS new,because the ALT circuit is open.

Jan 12, 2009 | 2000 Mazda MPV

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