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August 22, 2016
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Must have been a faulty regulator. Asp makes a few. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! The battery meter dips from about 15 or 16 down to below 14 and then back up to normal. When I use alot of accessories the battery voltage drops to 10.5 volts. I figured if it was the alternator my battery would eventually die, but the truck starts no problem for a couple months now. Whe only a few are used it will be as high as 14.6 volts driving and drops to 12.8 at idle and continues to drop as I … Do you have a separate voltmeter you could connect, either at the battery or at the cigarette lighter (has a direct wire back to the fuse block)? Solutions include driving in a lower gear below 35 MPH, letting the engine idle with everything off for 5 minutes at the end of each trip or getting a float charger (1.5 to 2 amps should work fine) and hooking up the battery to it overnight each night. When everything is totally off, the noise is 90% gone. Then passed the control to DME, sudden raise in Rpm to 700 rpm and I could see the DME alternator voltage is 15.4 . The charging voltage should be between 13.9v to 14.4v. You should have 13+ volts when the alternator is charging. Turn the key truck starts right up, battery gauge will be right around the 10volts mark for about 5 seconds. The battery shouldn't be bouncing much. Behavior: Idle fluctuation little bit more between 640-670 rpm., voltage shown on cluster fluctuate between 12.40 - 12.70 v . If the needle drops to 13 (or so) in about 10-25 miles of driving, stays there for a while, and then returns to a higher voltage (~14.5) and remains there for a while, that is not "rapid" - that's fairly normal. I'd say for the past 2 weeks now my truck started doing something kinda weird. It's usually fine when I first start it, but gets worse after the truck gets warm. Usually, you can detect this leak by measuring AC voltage at the alternator. 4,094 Posts. #1. I notice the volts on the gauge drop from 14.6V (Which I think is the normal running volts?) I have checked all the grounds and positive leads. Adam: The voltage at the battery should not drop below 12 volts engine off for a healthy battery, and not go above 14.5 when running. 15.3 is too high if you have an AGM battery. Do you know what type of battery you have? Hey everyone. This comes and goes at idle or highway speed. My car has many short trips in it's history, so my brushes seemed to wear a bit early at 92K. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. GM has issued a technical service bulletin #07-06-03-009 regarding Voltmeter fluctuates GM Trucks. The fluctuating voltage is by design. it would fluctuate randomly sometimes every 5 seconds several times in a row to intermittently. GM says fluctuating voltage on the vehicle’s voltmeter is NORMAL and is not a reason to replace any parts. It seems that it is surging a bit no matter what speed you are going and when it does this it actuallly causes the interior and exterior lights to dim and brighten along with the surging. Also the voltage at the battery and the voltage at the alternator should be within 0.5v of each other. Tell us which alternator, one-wire or … The voltage gauge fluctuates between 12 and 14 or so. This time, connect your meter's red lead to the B+ terminal on the back of the alternator, … Put a voltage meter across the battery while running and voltage was fluctuating from 9 volts to 13.5 down to 9 again over and over and over. #2 • Aug 19, 2019. Initially I thought maybe my battery (bought a new one), then the alternator (had it checked several times), then possibly a vacuum leak off the brake power booster. . From a 2011 BMW document "Power Management", The battery voltage can vary between 14 V and 15.5 V. The optimum charging voltage is set by the power module as a function of the state of charge of the battery, the battery. Voltage gauge fluctuates, but alternator checks out. Hi, I just started having some voltage fluctuations (according to to Volt gauge). 2) Turn car off, with engine bay hot. 2005 Chevrolet Silverado Voltage fluctuates.

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