I then turn on the lights, turn signal, fan, etc. 12,9 V at idle is normal. It is not a very scientific test, but it does show me the charging voltage at idle is higher than my static battery voltage and my alternator output is ABOVE nominal battery voltage. The battery condition is not related to the voltage guage unless it is really shot, and we can see this is not the case. My idling voltage at the pin is also around 13.5 and the software reads low. ... Generally, your car battery voltage should not drop between 12.6v overnight and should charge up to 13-14V while running or charging. ford, f150. mr2oc.com is not in any way affiliated with Toyota Motor Corporation. I'm not sure it is your battery connections since your lights would more likely flicker or you would have other electrical issues. Perform an Alternator Diode Test. Thanks all! Talked to the guy about the issue over the phone and he stated that it should be charging 14 volts at idle so I proceeded to tell him I would like to drop it off Saturday to get it looked at while it was still under warranty. Voltage drops to about 13.6v and while fluctuating +/- .08v eventually “drains” down to around 13v. Wrong you cannot compare it to your truck. Use a file to clean terminals if oxidation evident and apply dielectric grease afterwards to stop corrosion. It’s not a heat issue since new amp shuts down only when voltage increases. Test for voltage drop on the grounds, battery and charging system. Maintenance/Repairs. No problem!! VOLTAGE & CURRENT CHECKS. Even if Resistance is all good you can still have a faulty Stator as a Stator can pass … - Benjamin Franklin // "When the people fear the government, there is tyranny. If the voltage at the battery and alternator don't match. The voltage rises with rpm and drops at idle. Having been down a similar fault finding mission I would recommend confirming voltage on your EMS and then upgrading ground wire to help reduce losses. Come join the discussion about performance, modifications, troubleshooting, turbos, maintenance, and more! Nov 1, 2013. Technically, a motorcycle battery does charge while the motorcycle is idling though it does not provide as much amperage as when the motorcycle is at higher speeds. Checking for voltage drops in a circuit is a good way to find hidden problems that may be causing a charging problem. Both old Alpine amp and new amp are rated at 14.4 input voltage. This brought rpms to 750-800 at idle and I had 13.5+ vdc at operating temp. I have a 1996 ford f150 that when the weather is cold or damp the voltage runs really low almost to the point of stalling the truck. 1) With the voltmeter connected to battery, and key and engine off, record a "base" voltage reading. Question: I had my alternator rebuilt. At higher rpm voltage drops dramatically. At idle, most charging systems will produce 13.8 to 14.3 volts with no lights or accessories on (although some may charge at a slightly higher voltage depending on temperature, engine RPM, type of battery, and the battery's state of charge). First with the car turned off, and then with the car idling. At 12.2v the battery is in effect 50% discharged. If the voltage is below 12.6v it indicates that the battery isnt fully charged or has a fault. When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference. I think I mentioned this earlier,but it should read,warm motor and at idle,14.2 volts with all accessories turned off.When the motor is reved up alittle,it should climb to 14.4 or better.Mine usually runs around 14.6 when goin down the road at moderate speed and that's with all my accessories running.So I'm guessing you probably have a poor connection some where.Are your battery terminals clean and tight?? 14.8 would start to be a worry (there might be liquid or corrosion on the battery) and 15 volts would be a real concern, but 14.6 is fine. Do alternators charge at idle? When I measure the voltage at the battery terminals in the frunk while cold idle I get 13.4 When I measure the voltage at white cable in the engine bay fuse box I get 13.8 My TB butterfly was dirty as well as the idle air bypass holes(located under cover above the butterfly). While watching the light, I can kill my engine using the engine kill and see a distinct Reduction in headlight brightness. Open Question. Also the voltage at the battery and the voltage at the alternator should be within 0.5v of each other. Idle voltage should not be below 13.5 volts or above 14.5. Want Answer 0. If you consistently overload an alternator, you're going to burn up the diode packs in the back of the case. After riding roughly 45 minutes I'll be at 12.3 driving lights on, 12.9 lights off. Unless the voltage regulator in these bikes is different than any others I have worked on, the VR just limits the maximum DC voltage output from the bridge rectifier to protect the electrical system from an over voltage condition. At 12.4 volts, a car battery is 75% charged while … Print this page; Share this page × Ad. JavaScript is disabled. I got kinda the same problem. In this case the battery charging voltage is 14.61 volts with the engine at high idle. That will tell you where voltage is being lost, if in fact it is. My bill will be forth coming!! Agree with SkipII. My AEM is reporting 11.9 to 12.2 volts during warm idle. Tom Petty - Mary Jane's Last Dance. With the passin lights on,my voltmeter shows 14.1 at idle!! No alternator puts out full charging power at idle. Also replace new computer. This heat breaks down the electrical components in these units over time and causes the regulator to fail. Liberty is a well-armed lamb." Have replaced voltage regulator. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada, mr2oc.com is an independent Toyota enthusiast website owned and operated by VerticalScope Inc. My 2005 chrysler sebring. The problem with all the modern bikes, is these bikes have all the electronics that can be damaged when these thing go which can be costly. The alternator is a new Denso from rock auto. The voltage dropping on acceleration is odd tho - it's the exact opposite of what you should be seeing with a failing alternator (or just an alternator overloaded at idle, which means it's going to fail soon anyhow. If I turn off the lights etc, the voltage is about 13. On Sundays, I measure the voltage at the battery terminals, and register it. Did the engine speed actually dip, or was it just the tach that dipped? Battery only drains while running. This started me on an adventure. dfwcowboy57. Take me as I come 'cause I can't stay long. I am expecting a reasonable charger will charge the battery up to about 13.8 volts and maybe 14 volts. So all all times out alternator is putting out a full 800+ watts whether or not we actually need it or not. (It's always a good idea to check both battery and system ground connections, though.). A lot of guys on here,myself included,discovered the negative cable,where it attaches to the frame rail, was LOOSE.After tightening it,which took all of a minute to do,everything worked great,including that higher charge rate of 14.4 at idle. 2) If the voltage is greater than 12.6 volts (AGM batteries 12.8 … If it’s not that it’s almost certainly the voltage regulator. Is the ground cable,where it attaches to the frame rail,also clean and tight?? For a better experience, please enable JavaScript in your browser before proceeding. The alternator will charge the car’s battery by providing it with electricity. Battery is 12v AGM, only 1 month old. Now I am having a problem getting it to charge at idle, I get 14.5 volts at 1500 rpm, but as soon as I release the throttle it drops down to battery voltage, I've returned the alternator once already. When the government fears the people, there is freedom. I'm having the same problem antwan on November 11, 2017: Im have the same problem antwan. Does your bike do this. https://play.google.com/music/m/Tzw...=google&utm_medium=search&utm_campaign=lyrics, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Talked to the service department for the Indian dealer at hobe sound on Wednesday to confirm they were open on Saturday. It has no control of under voltage. If it is less than 12.4 volts, charge the battery and repeat the test. My AEM is reporting 11.9 to 12.2 volts during warm idle. The voltage with the car turned off is usually between 12.76 V to 12.8 V. With the car idling and the alternator … Battery is going dead during idle. At idle, battery is showing 14.2/3 and 14.8/9 when throttled. Content on mr2oc.com is generated by its users. Battery voltage fluctuates while in idle - 2001 Chevrolet Suburban. When I start it (cold, 1500 rpm) it charges about 14v. As the engine RPM’s drop, this may also explain the drop in voltage you see in your charging gauge. Either you have something kicking in and causing a major draw, or a bad voltage regulator. The battery above will slightly gas, but not enough to be harmful, and the battery will get a quick full charge recovery after starting. Clicking this will make more experts see the question and we will remind you when it gets answered. 14.4 volts is the gassing threshold. For a better experience, please enable JavaScript in your browser before proceeding. The regulators job is to take all the excess current and voltage and dump it to ground which creates a ton of heat. Hello, My mondeo mk3 gets a steady 14.4V from the alternator while idling. Any update on this? In other words, there must be voltage flowing through the circuit for the voltage drop test to detect a problem. Transformers are current limited based on their size. I will verify the voltage at AEM pin relative to chassi ground. [I have the SDH which is pretty much the Plain Jane of the Indian models] But when goin down the road,you should still be seeing "at least" a 14.2 reading on your volt meter.And that also applies to the automobile!! In a day you might be seeing 12 volts. Come join the discussion about performance, modifications, troubleshooting, maintenance, and builds for all Indian models. The answer will not be exact because the final charge voltage is not known. So when you hook the charger to a dead battery you might only see 4 or 5 volts. Alternators use diodes (in a rectifier) to direct current flow out of … Low battery voltage when in idle. A fully charged car battery has 12.6 volts. Showing 13.9 to 14.3 volts at battery at idle. Its power drops from 100% to 25%. A forum community dedicated to Toyota MR2 owners and enthusiasts. Not like a car where the output is demand driven. Specs for the Reg/rec show 14.3-14.8 is normal voltages, also there are also 2 ref/rec on this bike! Comment; Flag; More. With a voltmeter, you can tell what the battery voltage is, it will be the voltage that the voltmeter drops to when you first go to idle, and if the system can hold 12 Volts or better while you're idling for up to a few minutes, that seems like a normal system to me. The Stator (3 phase alternator) on our bikes runs at full output. If your bike is not producing a charging voltage (13.2VDC to 15VDC) at idle you have other issues that need addressed (possible rotor, stator, wiring/fuse, or regulator/rectifier) if it is producing more than 16VDC at any rpm you have a regulator issue and can destroy your battey and/or ecu. "Democracy is two wolves and a lamb deciding what to have for dinner. July 4, 2016, 9:22pm #1. Then that voltage would increase as the battery charged and required less current from the charger. And wires going to battery and alternator and starter are good to. "- Thomas Jefferson, My 111 is about 14.1 - 14.4 at idle and under load. Don't know about mine, but you can compare with your car/truck. It should be 14.1-14.4 at idle. All vehicles do that. Mines so bad that with a full load sometimes it will die at the stop light, If I have no load I am fine with the occasional voltage drop at the stop light. Voltage at AEM pin D1 (permanent power) while idling was 13.4. Voltage when the car is starting I assume you are talking about a 12 volt battery. While applying the same conditions as above. With a load on the current limited transformer the output voltage will drop. Voltage drop tests must be done while the engine is idling with a charging load on the system. Also, your battery is fully charged at 12.6-13.1vdc, so 12.4 is alittle low(80% charge), thus your alt is also going to stain some to compensate for that. At idle, most charging systems produce 13.8 to 15.3 volts with no lights or accessories on. Noticed after startup when the idle drops down to 750-800 I'm at about 12.9 at idle with driving lights on and 13.5 with them off. 2016 Indian Roadmaster / 2014 Triumph Rocket III Roadster ABS, Sounds like your voltage reg is on its way out. JavaScript is disabled. Confirm your battery / charging voltage directly at the battery, We have the tools we have the skills - anything is possible. Also check negative connection to chassis make sure it’s tight. Only way to know is to measure voltage at your AEM with a multi-meter while the car is running. Posted by ken smith on Apr 27, 2013. When this is not working properly, this may cause the engine to lack acceleration and stall in many cases at low speed or in idle situations as you have described. I have cleaned grounds, battery, ,neg cable, alt, belts, checked wiring and so on. Probably electric loading from the power steering pump. The voltage doesn’t have to differ much from 12.6v for it to indicate a discharged battery. The actual output voltage produced by the alternator will vary depending on temperature and load, and will usually be about 1.5 to 2 volts higher than battery voltage. Yes, your car battery will charge while it is idling and this is possible because of the alternator in the battery itself. Regulators on all motorcycles will fail at some pint. To get a consistent set of measurements, measure all voltages relative to chassis. Can anybody tell me what voltage reading I should be getting from the battery at 1000 to 1300 rpm? This year doesn’t have an electric cooling fan (on my ’01 Jeep that sucks down .4v to .6v at idle), and as it’s a brand new battery I haven’t let it run to the point where it goes below 13v. It then only “charges”/ stops charging 12.5v (battery voltage, and then drops). For example the battery reads 12v and alternator reads 14v. Mine is,and always has been, 14.4-14.6 volts which is actually where ya wanna see it.However,I do not have all the bells and whistles and extra lights like many of you guys do. Performed the stator ac voltage output test. Your battery connections are loose - check clean and tighten. This started me on an adventure. One of the most annoying things a car owner can experience is leaving your car with a full charge one day and trying to start it the next day only to discover that the car won’t start because the battery’s voltage has dropped so low during the night. With the passin lights on,and the motor at idle,my voltmeter shows 14.1 volts!! Question about 2011 Harley Davidson FXDB Street Bob. Couple months ago I noticed my driving lights going dim while idling on my 2017 dark horse. VOLTAGE TEST. During a normal ride, a motorcycle provides about 13, 14, or 15 amps while idling only provides less than 1 amp. (Your battery should have a minimum of 12.4 volts.) If you have voltage fluctuations while the engine is running it is an indicator of a problem with the charging circuit, or a major short.