Questions tagged [voltage]

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1answer
65 views

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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0answers
27 views

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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0answers
49 views

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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1answer
26 views

How to minimize voltage loss

I have a '79 bike that is currently experiencing voltage loss, causing the battery to die after a couple hours of riding. It is clear there is lots of corrosion and rust on many of the wires and ...
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1answer
57 views

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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2answers
63 views

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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3answers
1k views

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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1answer
540 views

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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1answer
58 views

Is there a way to reliably test voltage of a 12V battery when it's not disconnected (i.e., partly loaded)?

I'm having an issue where a fully charged battery doesn't necessarily report the proper voltage when checked from the socket within the car, because in order to have the socket activated, the car has ...
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1answer
996 views

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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1answer
471 views

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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1answer
35 views

what is the safe volts for truck battery?

I have a device for checking battery volts but I don't know what is the acceptable limit for the battery volts
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0answers
103 views

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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2answers
431 views

testing for voltage

I am sitting with a problem that is slowly draining my wallet. I drive a opel corsa utility 14i, and after having to replace a blown head gasket, all sorts of gremlins started popping up. First no ...
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1answer
68 views

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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1answer
127 views

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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1answer
69 views

Zero Volt reading when motorcycle is running?

On a Suzuki gs 550 motorcycle battery reads 12.6 Volts DC when the motor is off. But when I start the motor, digital voltmeter reads zero. I have never seen this before. Any ideas?
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3answers
47 views

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 ...
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2answers
171 views

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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0answers
185 views

O2 Sensor Voltage Output

I have an Acura legend (1995) that I did a header swap on and replaced the o2 sensors. They aren’t connected as of now and the car is running rich because of it. If I wanted to trick the car into ...
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1answer
382 views

What is BM voltage?

I'm reading in my car's repair manual that I need to check "power supply voltage (+BM)". It also uses the phrase: "power supply circuit (+BM)". What is BM voltage?
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1answer
27 views

Battery Problems [duplicate]

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, without upgrading the stock reg. all ...
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2answers
2k views

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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2answers
2k views

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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1answer
112 views

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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4answers
1k views

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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2answers
3k views

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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1answer
761 views

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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3answers
140 views

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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2answers
279 views

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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2answers
11k views

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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2answers
4k views

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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1answer
1k views

How to connect pc speaker with 12v output in car without noise and voltage issues

I am having a pc speaker which i need to connect with 12v output in my car. I have to exclude my adaptor section and directly connect the power from the 12v supply to speaker power input. Car: ...
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0answers
85 views

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 ...
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4answers
25k views

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 ...
3
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1answer
252 views

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 ...
3
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1answer
3k views

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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4answers
2k views

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 ...
2
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2answers
521 views

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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2answers
681 views

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 ...