NRMA jump started me and it looks like the alternator doesnt put out proper charge at current idle. Newly designed ventilation which cools the coils better; Advantage. Reactions: Dave Z and Bob Lincoln. You should see the difference. We know for example, that a 1950 Chevrolet has an idle speed of about 700-800 rpms. The new Leece-Neville IdlePro Extreme™ series alternators offer industry-best output at low engine speeds, utilizing a high-amp, brushless design. Once you ve reached the peak alternator rpm, in this case at 4,000 rpm, increased speed doesn t create more power output. Advertised Maximum Output @ 4,800 – 5,200 RPM. If you only require a little more power at lower engine speeds you may be able to use a smaller pulley. Although alternator manufacturers, rebuilders, and suppliers typically refer to the rated output in promotional materials, both the ISO and the SAE require a format of “IL / IRA VTV,” where IL is the low, or idle, amperage output, IR is the rated amperage output, and VT is the test voltage. These figures are alternator RPM speed. Worth noting that an alternator (AC output) does not have a speed/Voltage relationship. Or a weak relay if somone added one. A bad switch breaker so replace the switch. Think lights on and engine off. Should be around 14 Volts. Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30497 Post Options Vehicle is a 2000 Acura TL. Mark is actually dreaming. Depending on ambient temperature, charging voltage varies. Lastly you need to consider the idle speed of your engine. Testing Alternator Amperage Output. Testing the voltage output of the alternator is one way to detect problems with the alternator. 13.93 battery, 14.00 alt running idle. n0 for the Mahle 120A AAK alternator is 1400 RPM, meaning that no output current should be expected from it at that RPM. Alternator output is most definitely determined by alternator speed. If the voltage is especially low, the alternator may be bad. Actually there could be 3 things. 1) Is my method of testing alternator output correct? 13.60 battery, 13.70 alt load 1,500 rpm's. Happy New Year to you all. 208 Posts . The new modulation scheme. Our alternators are tested on our test bench to provide the best output for most driving conditions including low speed or idle operation. The alternator should be tested with the engine idling and electrical accessories, such as the radio and headlights, turned off. may be implemented with simple control hardware, and without. New patented technology: The unique use of permanent magnets enables the high output Eco-Tech 305-I alternator to generate 260 Amperes (135 Amperes for 28V versions) at 1,800 Alternator RPM as compared to 2000 RPM, the idle speed most often quoted by competitors.This high-at-idle alternator is a unique solution to achieving high output at low RPMs. Alternator Output. Alternator slippage and undercharging can also be caused by a bad alternator pulley. The lights may dim but they should not go out at all weather the alternator is putting out or not. 13.50 case and block 1,500 rpm's load. If I increase the RPMS a little the alternator kicks in. The other main connection on the alternator is the output terminal that charges the battery. If your idle speed is below 1200 rpms, that will reduce a modern alternator's output even further. 12.44 battery, alternator, idle under load. I thought the curve was versus engine speed, forgetting about the small alternator pulley. Often times the battery is taking up part of the load. The least expensive upgrade from the 10-DN would be to step up to a 10-SI or 12-SI. This is a 4M40, series 1. OAP pulleys have a one-way clutch inside the center of the pulley that slips and allows the pulley to free-wheel when engine speed suddenly drops. 12.23 alternator case and block idle load. With my factory idle speed of 865 RPM and crank/alternator pulley ratio of 130/80=1.63, my alternator should be turning 1405 RPM at engine idle. The alternator will turn at idle but does not produce the maximum current. The original 1960’s GM alternator employs an external voltage regulator. 13.80 battery, 13.83 alt 1,500 rpm's. In the case of a 12-volt applications much of this wisdom also applies. Probably 3:1 so a 2400 rpm alternator shaft speed would translate to a 800 rpm engine speed, but I certainly am not sure of the Alternator Shaft ratio to Engine Crankshaft Pully ratio. Save Share. No alternator can output it's full amp rating at idle. But it is safe to keep a few pointers in your mind. Using @landphil number of 3:1, just over 750 rpm engine idle speed would be about 2250 alternator rpm on the curve, which shows exactly 200 amp output. It could very well be 2:1, which would put the engine speed at 1,000 rpm for a Alternator Shaft speed … One way to test your alternator's output voltage (crudely) would be to throw a multimeter across the battery posts with the engine shut down, then start it up and take another reading. Remember, this is alternator-not engine speed. At idle, the amp output is low, and this is normal. An alternator should put out between 13.5 and 15 volts of power. Most belt driven alternators in cars and trucks are not driven 1:1 at engine speed. For example, Ueda, U. S. Patent No. The alternator spins at a higher RPM than the engine. So my question is this. SUPERIOR AMP OUTPUT Delivers higher amps at idle and cruise speed compared to the competition. Constant regulated output regardless of driven speed. Typically a 12 volt DC unit will begin making power around 1000 rpm's. A failing alternator will cause many problems for a vehicle and will eventually result in the engine stalling or being unable to start. If the alternator output voltage is fluctuating it's likely to be a fault in the solid state control pack, usually integral with the alternator. Improved Output at Low-Engine Speeds Minimum of 90% output of unit’s rated maximum output at engine idle speed* provides efficient, battery-saving performance Premium Brushless Design Best-in-class brushless performance without the weight & size downfalls of conventional alternators Overrunning Alternator Pulleys (OAP) are used on a number of late-model import and domestic vehicles. Then when you increase RPM, the alternator will put out more amps to recharge the battery. The alternator needs enough output at engine idle speed to keep the electrical system of the vehicle functional. Most systems are designed to create just enough power at idle to keep running. Perhaps as low as engine idle speed on many cars. As long as the engine is on, the alternator will keep on charging the battery. Thank you. With 12+ volts in the system the lights should be on. If you run a 600 RPM with blower, wipers, A/C, rear window defoggers, and headlights, the alternator will put out about 30-40 amps. There are several ways to get more power at lower engine speeds. There are two things that will cause this. Discussion Starter • #1 • Jan 3, 2017. The specifications you see on our website reflect results as follows: Advertised Idle Output @ 2,400 RPM. Best-in-class IdlePro Extreme alternators feature an array of engineering benefits that enhance electrical system and engine performance to extend battery life and increase vehicle uptime. The smaller pulley turns the alternator faster at lower speeds thus making more power. or current limits of the alternator. In addition to testing the output voltage of an alternator, checking the amperage output is also vital. This is accomplished by the pulley sizes. And does that mean my alternator is outputting good power? 5,712,786, proposes an engine idle speed control method that employs, among other features, a map related to engine idle speed and alternator field duty cycle to determine alternator output current without using a shunt. If you are having problems with overall alternator output or charging at engine idle, maybe a smaller pulley is all you need. It just doesn't seem to charge at an idle. This alternator (10-DN), uses a flat, two-prong connection at the back of the alternator. 2) Could a bad ground cable be responsible for the described issue? Low voltage may also be caused by poor electrical connections, a loose drive belt, low engine idle speed, and a number of other issues. Idle speed will be your lowest output voltage, and by 1000 RPM you should be at full output. The most important thing is that the power goes in one end and exits the other. alternator output power at idle speed without violating thermal. Alternator output is on demand when there are loads detected or the battery needs to be charged. The alternator pulley is usually smaller, making the alternator turn faster than engine speed. Alternator Output at Idle Speed. Can provide useful charge at idle speed Use slip rings , having greatly extended brush life over a commutator The brushes in an alternator carry only DC excitation current, which is a small fraction of the current carried by the brushes of a DC generator, which carry the generator's entire output (Seems a little low too). Idle speed and alternator pulley size can also affect alternator output. If the application calls for considerable output at idle speed, but not especially a high gross output; then the souped-up 10SI may also live a long life. Burned stator windings are common, in applications that continuously require a high amount of alternator output, and so are heat-damaged rectifiers. An alternator should put out between 13.5 and 15 volts of power. How do you increase the engines idle speed. An alternator reaches max output at a relatively low RPM. The connection was corroded very badly -- keep your grounds CLEAN. Generally 1200 rpm's = 10amps, 1500rpm's = 20 amps, and 2000rpm's = 35 amps, max output is reached at 4500 rpm's (51 amps). 3Amp better alternator output at idle speed range that is roughly equivalent to the necessary output … The alternator, on the other hand, is driven by the engine in your car. Improving Alternator Output at Idle Speed . Check the amperage output at the rear of the alternator and see if it is more or less than the amperage coming out of the battery's positive cable. A reduced output may be a sign that the alternator is failing, but the drive belt and wiring should be inspected before replacing the alternator. Below that the power output varies. This document introduces a new SMR modulation strategy capable of improving alternator output power at idle speed without violating thermal or current limits of the alternator. The curve is not straight either. While use of an SMR and load matching control enables large improvements in output power at cruising speed, no extra power is obtained at idle. The rest will come right out of the battery. Reply. It is a give and take sort of relationship between the two. 13.90 alternator case and block idle. EDIT: Problem was fixed, it was the ground cable. So an engine that idles at 700 rpm with a 3:1 pulley sizes can have an alternator spinning at 2100RPM when the engine is idling.
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