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Alternator how many amps output What alternator do i have to buy

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Bosch High Output Alternators deliver amperage output up to 200 amps

Posted on Sep 14, 2010

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Code p0563


This may help you after replacing an alternator.

If All connections, cables, and computer are in good shape. The problem is that re-manufactured alternators installed, simply would not communicate with Ford's "power train control module". They absolutely charge the battery (14.5 volts and as much as 60 amps of current, just after cranking), the warning light just didn't know it. Further, most of the alternators are correct for the year model and engine, according to parts description. Go to the junk yard and buy a factory alternator out of a wrecked Explorer and this will sort the warning light immediately.

Another problem is the parts stores can only test the output of an alternator, they can not check the indicator circuit. all new alternators will checked OK but it might not be correct for your power train module.

Lesson learned: when it comes to electric components, buy factory.

Aug 19, 2014 | Ford Explorer Cars & Trucks

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High Output Alternator (240amp) with idle voltage at 13.7. How do I get past the PCM and bring voltage up to at least 14.4? 2013 Camry SE 4Cyl


David,

The high output alternator you have puts out higher amps - not volts. 13.5 volts out is more than enough to keep your car battery charged. Excessive voltage will damage a battery.

If your car requires more amps than the original alternator was able to provide to (1) run the car and (2) all the electric accessories; then a higher output alternator is needed (the battery is only needed to start the engine, that's it - they are designed to provide a large amount of current (amps) for a short period of time as when starting). Otherwise, the battery would have to make up the difference between the what the alternator can provide and the actual amount of amps needed / used. Used this way, the battery lights would dim, engine slows and everything would just stop and go dark.

If you're running a powerful audio amplifier, the current it might need may be so much current that it may be too much for the alternator alone to provide - hence the high output style was installed. You can use one or more large value capacitors - or additional batteries to "fill" in whenever the amplifier briefly needs more current than the alternator can provide - without drawing on the main car battery.

Your alternator is probably just fine.

Apr 07, 2014 | Toyota Camry Cars & Trucks

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Voltage gauge drops alternator squeals. When using plow


INSPECT BATTERY ELECTROLYTE LEVEL
INSPECT BATTERY CABLES/TERMINALS
LOAD TEST BATTERY,_______VOLTS @ 150 AMPS (Min SPEC 10.2 VOLTS @ 150 AMPS.)
INSPECT BELT(s),
TEST ALTERNATOR OUTPUT (ON THE VEHICLE,'NOT' BENCH TESTED),
1 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW not ENGAGED
2 _____AMPS @ 12 VOLTS @ 2500 RPM w/PLOW ENGAGED ALT OUTPUT SPEC ????

Feb 04, 2014 | GMC Sierra Cars & Trucks

1 Answer

How do i find out which alternater to buy for my 2002 olds silhouette


You may be able to find a number stamped on the back of the alternator. Usually the higher output models were used if you have heated seats or other high amp accessories.
It may not make a big difference which one you buy if both parts bolt on the same way.

Jan 09, 2013 | 2002 Oldsmobile Silhouette

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2nd newly rebuilt alternator burning out.


Due to the nature of the battery technology used with vehicles the alternator is mostly incapable of charging the battery. The car alternator is designed to keep a fully charged battery fully charged and to provide all the power for the car equipment.

The alternator charge rate is regulated by a voltage regulator. Because the alternator output is connected to the battery, the alternator and battery voltage will be the same and the voltage regulator monitors that voltage.

The lower the battery voltage the more output the alternator will produce in order to correct the situation but because a lead acid battery has a high internal resistance to accepting a charge the terminal voltage will quickly rise to the alternator regulated voltage and fool the alternator into thinking the battery is fully charged when the output will drop to the order of just a couple of amps.

Switch on the headlights or a similar load that will lower the battery voltage and the alternator will increase it's output again - but only by the amount of current the headlamps or other load is consuming.
It matters not what the alternator rated maximum output is, it is designed to provide only the necessary current and no more.

The only time an alternator should ever need to produce maximum output is when on a dedicated testbed and then only for a short duration to avoid damaging the unit. Testing the current output on a modern vehicle is not recommended except for the regulated voltage testing and a rule-of-thumb output test where all equipment is switched on and the engine speed raised while the battery voltage is monitored.

Most modern alternators use an internal voltage regulator but a few systems use a separate voltage regulator. No alternator rebuild would be complete without a regulator test and probably a new or replacement regulator, which is where the majority of charging system problems are, or the brush gear.
Assuming the wiring is ok, no alternator should suffer any harm if the voltage regulator and auxilliary diodes (if fitted) are in good order though fitting a defective or a discharged battery can cause it to overheat and be damaged.

The alternator usually just about stops producing an output when the battery voltage is in the region of 14.5/14.8 volts.
Your description indicates the voltage regulator is not working correctly - unless 40 amps was being consumed by the car equipment the alternator should not have been producing 40 amps.. I suggest you also have your battery tested

May 12, 2017 | 1988 Acura Legend

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What is the stock Alternator AMP output for 2003


You have two options If the truck is stock then the 95 amp is fine but if your running aftermarket accessories then you would benifit from the 130 amp. All the alternator has to do is keep up with the load being applied.

Jan 04, 2010 | 2003 Ford Explorer

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I need to replace the alternator on my Mercedes Benz 190e 2.3 engine. Suppliers offer re-manufactured alternators from 55 to 70 amps and as the amperage goes up so does the price. If the 55 amp alternator...


it depends on what accessories you're running. If your vehicle has every electric option under the sun, you would want the higher output alternator. Same if you were running a high-output stereo or something like that. It all comes down to what you need.

Dec 20, 2009 | 1986 Mercedes-Benz 190

2 Answers

Need to replace serpentine belt, how do I know what amperage the alternator is?


Most times the output is stamped on the case. If you can't see it, remove the belt and match it with the new one before installing it, or, buy both and return the one you did not use. Generally the most common one is the lower output...higher output ones are used on special applications such as police cars, vehicles with dual batteriesor other vehicles that are equipped with lots of additional electronics not found in "regular" passenger vehicles.

Dec 03, 2009 | 2001 Chevrolet Silverado 1500

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New battery when i turn on the heat. my battery light came on? why


The alternator should be tested for its operational value in this case. There may be some issues with the charge rate.

Testing the amperage output of the alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage. Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter is needed. Once the meter is connected start the engine. Next turn on all electrical accessories and raise the engine idle to about 1200 RPM. The alternator should output the max amperage it was designed to produce. Example: a 90 amp alternator should output about 88 amps. Note: An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail. An alternator is designed to operate at max amperage output only for a reasonable amount of time.

((Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive) at engine idle the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.)))

Oct 08, 2009 | 1999 Ford Contour

2 Answers

1997 Cadillac Catera: When the AC is on and the cooling fan comes on the charging guage drops to almost the red. voltage at battery drops from 14.6 to 13.2 and shows undercharge on a battery testing meter....


A charge rate of 13.2 is fine...Likely your battery is getting older and is not charging as well as it used to. You should periodically re-charge the battery using an external charger, as the alternators actual function is to maintain the batteries state of charge, not to re-charge it. Opening the doors, playing the radio with the engine off etc, can and will drain your battery. The alternator will only put a surface charge there and will not actually replace this lost power. I'd begin to worry if charge rate dropped below 12.9.but even then you likely would not have any real problems.

Jul 16, 2009 | 1997 Cadillac Catera

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