Questions tagged [voltage]
The voltage tag has no usage guidance.
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Do month-year coloured dots on batteries signify install-by expiration date?
As per How do you know if the replacement battery is a good one?, it may be the case that I've purchased a battery that may not be at its best.
I got it from a VW dealer installed on 2016-10-01; it ...
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Battery resting voltage drop after trying to start
My girlfriend's 09 Camry is not starting unless it gets jumped. She took the car to Autozone where they tested the battery and alternator and said both were fine. I measured the voltage across battery ...
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Can the amount of ampere hours in a car battery be determined by it's output in volts?
Let say an average car battery has a 48 amp-hour capacity. Is it possible to determine how many ampere hours are left in a battery if the volts are known? What about if they are lower (e.g., 8 V) than ...
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Alternator squeal
98 rav4.
I have a bad squeal, however I tried a new alternator and it did not go away. The charging voltage does not go above 12.3 and when I unplug the plug on the back of the alternator the ...
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Why does my car's switched 12V drop to 5V when I add an accessory?
Disclaimer: I have very little electrical knowledge.
I have wired electronics (radar detectors, dash cameras, GPS units, etc.) to about a dozen vehicles in the past, but have ran into a strange issue ...
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No Start: Bad starter solenoid, bad wiring, or a defective anti-theft system?
The vehicle is a 2010 Fiat Ducato (x250) 2.3L Turbo Diesel with an old third party Ituran anti-theft system.
There are two codes
U1602 CAN Line, Bus Off in the Instrument Cluster - intermittent
D602 ...
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3
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ECM voltage, spark spike
When the car was idling in the garage this morning (hooked up to HP Tuners), I saw a spike on the "Spark" graph at the same time as the car stumbled. "Control Module Voltage" also went from > 14 down ...
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Safe voltages for jump starting
For various reasons, I keep several very large four cell lithium-polymer batteries in my vehicle. Each of these batteries is rated for over 100 amps of constant current, with 10 second burst ratings ...
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Connecting Fuse Tap to another Fuse location
This question is similar to can i split off another circuit from fuse box to run power to cigarette lighter?, however I want to know the mechanics of mismatching amperage when it comes to fuse tapping:...
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Automotive Power
Need to figure out how much constant power car is drawing in the on position, without the motor running.
Issue: Need to have car on in order to have computer, stereo and all electronics functioning ...
Barry
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Acceptable battery voltage drop overnight
This is a follow up to this question that I asked previously.
Since asking that question, I have kept my same commute, but have been driving consistently 30+ miles on the weekend. In addition, I have ...
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Low voltage when using remote starter
Recently, I have been unable to remote start my 2003 Honda Accord Coupe. I brought the car to an auto-zone, and they told me (after hooking my battery up to a voltage tester) that I had "low voltage" ...
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Start Engine If Battery Drops Below "X" Volts
I use a lot of devices in my work vehicle that are typically running when the engine is off. I was doing some reading into ways to maintain battery voltage and I read that there was a device that ...
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2015 Kia Forte Intermittent Low Voltage Occurrences - P0562
2015 Kia Forte
I’m hoping people can throw some ideas to this one, we are really struggling to pinpoint the issue. Many thanks in advance.
Issue Summary:
Intermittently, while driving, my car will ...
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Is my car battery health bad and should I replace it?
I bought a 2010 Golf in march and I do not know how old the battery is (no dates on the battery) and with winter coming in I feel a bit nervous.
Usage
I do not use the car very often but I try to ...
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How is alternator directly connected to vehicle electronics?
I've tried a lot of research but I can't find specifically what I'm looking for no one has actually mentioned this and I've looked at various wiring diagrams which still don't prove how this is ...
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How do you know if the replacement battery is a good one?
How do you know if the replacement 12V battery is a good one?
The 000 915 105 DE one I got for my 2008 Jetta 2.5L SE appears to have the "9/16" sticker on it, as well as "3216" inscription (which may ...
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Is 15 Volts too high of a voltage to run on automotive electrical systems?
Is 15 Volts too high of a voltage to run on automotive electrical systems? And if so, would filtering the current thru an old style voltage regulator work to lower it to an acceptable voltage ???
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Bosch MAP Sensor Voltage issue
For those who think: TL;DR long story short:
I want to measure the voltage output at certain temperature but do not get a signal.
Details:
I have a BOSCH MAP Sensor here (0281006108), it has 4 Pins:...
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Confusing DTC terminology?
I've noticed that many trouble codes use similar wording for the same problem and can't really distinguish between them, for instance.
P0105 Manifold Abs.Pressure or Bar.Pressure Voltage supply
P0106 ...
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2
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How can a battery indicator be on when the alternator is providing adequate voltage?
I'm under the impression that the battery light indicates that charge is flowing "out of" the battery. Normally the battery is being continuously overcharged by a couple volts, meaning that electrons ...
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Slow crank no start, voltage drop
A few days ago it was -20 and my car wouldn't start. It cranked for a few seconds then slowed down. Tried to jump start it but had the same results.
I checked voltage on the battery posts and it ...
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Battery at 13.7 volts disconnected, 14.7 with engine idle or revving, while various small intermittent problems suggest voltage is low?
I've had a few problems after driving my longsuffering 1997 RAV4 on a bad dirt road including a shallow river crossing, and I think they're related and something to do with the electrics, but I can't ...
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Is alternator/voltage-regulator supposed to power everything always at 13.5V+ at idle?
As a follow-up from how fast does the alternator charge the battery?, how powerful are alternators supposed to be at idle?
Specifically, if I have a lot of OEM accessories in my 2008 Jetta 2.5L SE, ...
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12V AGM battery charging voltage
I have the following 12V car battery: Varta Silver Dynamic AGM 595901085 (12V/95Ah/850A), and the following car: Jaguar S-Type 2.7D.
In the technical cars manual it says this:
So in cold winter ...
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How much accurate car cigarette lighter port is?
My car's generator is putting out 13.5 voltages when on full load (blower, ac, lights etc) but when i check the voltage on car's cigarette lighter port it it drops to even 11.6 when blower is on, when ...
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0
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No voltage between ECU GND and 5V
I had a short circuit problem with my car because of a faulty fuse and some of the engine harness wires melted together. I repaired the harness the engine starts normally but I am getting Signal high ...
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2019 Jeep Cherokee won't start
My car is a 2019 Jeep Cherokee on Friday my car wouldn't start. On my dashboard it said low battery voltage. I have had the battery a year and a half. I had someone jump it off and it started up. I ...
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12 volt circuit Voltmeter shows drop
My voltmeter shows 12.46 volts across the terminals of the battery when ignition is off and on.
As soon as the car starts, the voltmeter reads 1. This reading would normally be seen when measuring ...
user127467
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2
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O2 Sensor Problems
So let’s say for some reason that my o2 sensor is unplugged. If I jump 0.2 or 0.3 volts to the harness going back to the ecu would it work into tricking the engine to run a little less rich to save ...
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What is max voltage in 24V car's cigarette socket?
Do regular adapters for USB work in both 12V and 24V car systems? Would they work with 28-29V (when alternator is running)?
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Battery Voltage low when car is running. Should I be concerned?
Car: 2010 Mazda 3 GT 2.5L Manual 160,000KMs
I purchased the car 3 months ago not knowing the history of the battery, I wanted to test it.
I measured the voltage across my battery using a voltmeter ...
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1
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AGM Battery - Residual Voltage?
Wife's 2018 Mercedes GLA250. Car is 3 Years and 4 months old. Just turned over 12k miles. The AGM battery is at 12.25Volts after sitting unused for a week.
Everything I read says an AGM battery should ...
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Bad alternators?
My elderly neighbor has a 1998 Expedition with an alternator problem as all of the units I've installed and tested output less than 12v.
He wants to save some money and purchases used alternators ...
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Check engine light turns off after jump start
So basically there has been a check engine light on my car for almost 2 weeks now. I took a risk today and went out with freinds to get food. My freind accidentally left the door open which left the ...
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1
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Why won't my 2004 dodge durango stay running after jumping it
I hooked car reader up and these are the numbers it gave;
U1120
P0700
P0562
Where do I start to troubleshoot this?
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Faulty Motorcycle Regulator?
I am on my second 12v motorcycle battery in a couple of weeks. Will a faulty regulator, ie too higher volts, cause this?
Also I have upgraded my ct110 to a 160cc, all works well for a few days, then ...
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02 FORESTER VOLTAGE
Ran the codes on 02 Forester. We came up with P0328 Knock Sensor. I am putting on new fuel filter and plug wires. Does anyone know what voltage I should be pulling off of the knock sensor. Right ...
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Battery Open circuit voltage
I purchased a battery 4 weeks ago and have had trouble starting the car. I think it is the starter, however, I have had the battery on the charger for 3+ days and it is reading 13.1 volts open ...
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Fusible Link vs Fuses
Problem:
I have some voltage drop between the battery positive and the alternator. I'm planning to solve it by replacing the wire. I would like to build my own cable and upsize the wire for future ...
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12 to 24v charging with isolator
I'm trying to find the best way to charge my 24v solar battery bank off my 12v bus system. The simple way seems to be a step-up converter and a diode, but I'm wondering if I can replace the diode with ...
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How can I get my H.O. alternator to charge at 14.Xv?
I recently installed an Eagle High 250amp H.O. alternator in my 2015 Altima.
Immediately upon starting the engine my battery light came on.
I hooked up my OBD-II scanner and it shows that the CPU ...
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0
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Drop down to zero during ride
Randomly during ride, the "D" from transmission indicator disappears for 2-3 seconds, during this time the car like switched to neutral (RPM raise without acceleration of the car).
In the beginning ...
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Alternator problems: First too much voltage now not enough
I had to put in a new alternator in my 99 Isuzu Amigo. The old one burnt up. Everything seemed fine...output was around 14.4 volts, however, the plug that goes to the "S" & "L" terminals on the ...
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Voltage measurements with the alternator running fluctuate
I own a 1994 Mazda Protege. On Sundays, I measure the voltage at the battery terminals, and register it. First with the car turned off, and then with the car idling.
The voltage with the car turned ...
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How to fix a voltage drop on car power door lock
I've installed a Keetec car power door lock on my car. It works on four doors but even though it locks and unlocks the voltage on the actuators drops to about 7-8V. Problem is that the control unit ...
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How can I test and find the polarity of an ignition coil (that's not connected to a car) using a multi-meter
How can I test and find the polarity of an ignition coil (that's not connected to a car) using a multi-meter.
Just to let you know coils can have polarity when DC Voltage is placed on them. https://...
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High battery voltage, no (noticed) symptoms, issue? [duplicate]
My dashboard screen in my 2013 Chevy Cruze usually reads between 14.9-15.1v lately. I've been told that this is unusually high. Given this though, I have not experienced any problems as a result of ...
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Upstream O2 sensor stays at 0.4V
To test the upstream O2 sensor on a 2011 Toyota Corolla, I backprobed it with a multimeter.
After I idled the engine for a few minutes to warm it up, the multimeter shows a steady voltage of 0.4V.
But ...
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Choose Correct Diode
I had to do some creative wiring on my car's A/C to get it working without a $1000 repair bill. Now the A/C works perfectly, but I need to isolate the current on one of the wires to so that it only ...
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