Alternator or charging system failure on the 2000 Mercury Cougar
5 fires 5 of the 49 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
When alternator or charging system failure gets reported
Owners of the 2000 Mercury Cougar report alternator or charging system failure at a median of 60,000 miles. A quarter of the reports come in before 50,000 miles and a quarter after 75,000 miles, from 20 reports that carried an odometer reading.
A part like this is normally expected to survive 98,000 miles. It is the 1st most-reported problem on this model year.
The mileage distribution
The reported range runs from 35,000 miles at the tenth percentile to 95,000 miles at the ninetieth, a spread of 58,200 miles across the middle 80% of reports.
Reports bunched into a band this tight usually mean the component has a life of its own: it goes at roughly the same mileage regardless of who owns it.
10% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 35,000 miles | 52,000 miles | 62,000 miles | 76,250 miles | 93,200 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Of these reports, 5 a fire is mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
Putting it right typically runs $450–$1,600 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 3 model years of this car. It shows up earliest on the 2000, at a median of 60,000 miles, and latest on the 2002 at 135,000 miles.
By volume the 2000 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
Vehicle had loss of power and lights were flickering. Wiring harness, alternator and voltage regulator need replaced.vehicle has 47000 miles on it. Dealer said it was 4th cougar with exact same problem but yet no recall. Cost of repair is at least $800.00.
This is the 2nd time that I am replacing an alternator on my 2000 mercury cougar. This time, it's been less than a year since I replaced the old one. This seems to be an ongoing problem with the 2000 cougar, and mercury/ford have no intentions on recalling the vehicle for this problem. It's extremely frustrating that the alternator keeps going on this vehicle. Of course it keeps happening after the warranty is up, causing you to have to shell out hundreds of dollars over and over again. This last time, not only did I have to replace the alternator, but I had to pay $175.00 for towing because I was 75 miles away from home. This is ridiculous, and I am considering getting rid of this car once it is paid off next year. And since there are other people who are having the same problem, and mercury/ford does not want to recall this vehicle, I will never purchase a car from this company again. Clearly there is something causing the alternator on the 2000 mercury cougar to keep going, but the maker will not recall the vehicle.*ak
Alternator in my 2000 mercury cougar failed for the third time. The car is now out of warranty and I am stuck with the bill. Failure was followed by smoking in the engine compartment which steadily increased, small fire evolved soon afterward. Was able to put it out with a bottle of coke (a brand that has never let me down). I was assured by the dealership that this issue was taken care of some time ago. I have hated this car for all of its problems and have successfully steered people away from ford products. I will never purchase another domestic vehicle for as long as I live. *ak
Also reported on the 2000 Mercury Cougar
Fuel pump failure
No-start or intermittent start failure
Other electrical problem
Other engine problem
Sunroof failure or glass breakage
Other speed control problem
How far this goes
Complaints are voluntary, so 49 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does alternator or charging system failure happen on the 2000 Mercury Cougar?
Across 20 owner reports that included an odometer reading, half were filed by 60,000 miles. A quarter were filed before 50,000 miles and a quarter after 75,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is alternator or charging system failure on the 2000 Mercury Cougar?
49 reports have been filed with NHTSA, about 0.8 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed