Questions tagged [voltage]

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Battery voltage 2019 Chevy Silverado 1500

Hello everyone I recently got a new battery and had alternator checked and was good. When driving in the early morning voltage stays at 14 which it should but when parked for a while and u go to work ...
Jeremy's user avatar
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0 answers
38 views

04 Honda pilot only reading 11.2v on OBD, alternator is brand new, battery replaced in August

So...my wife's 04 pilot battery light came on, it had come on intermittently over the past months but never stayed on until today. Hooked up my OBD, 11.2v. Damn, so i replaced the alternator, which ...
Bill's user avatar
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0 answers
44 views

Undervoltages detected in rear fog light, not working, Mondeo MK4

I have a Ford Mondeo MK4 Saloon from around '08, Ireland, Right hand drive. Last year I noticed that only one of the reversing lights was working, but the car test passed it anyway. However when the ...
spl's user avatar
  • 101
0 votes
2 answers
63 views

Why does loading a circuit cause a voltage drop?

So this question relates to cars but applies to all electronic circuits really. I was watching a car diagnostic video on youtube and in the video he demonstrates the difference between doing voltage ...
Aden's user avatar
  • 81
3 votes
1 answer
263 views

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 ...
jenhil34's user avatar
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1 vote
0 answers
228 views

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 ...
ak_'s user avatar
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1 answer
61 views

2006 Ford F 150 5.4 Triton motor XLT Alternator No Charging

I New Alternator New Fusible link and I still have low voltage battery light in the dash that went away I have read a lot in I Can Find The problem HELP
Angel's user avatar
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2 votes
1 answer
120 views

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 ...
Aden's user avatar
  • 81
2 votes
2 answers
526 views

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 ...
Ohno06gt 's user avatar
1 vote
1 answer
95 views

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)?
Name's user avatar
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2 votes
0 answers
294 views

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 ...
giannisf's user avatar
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0 answers
352 views

Brand new alternator: only 2 Volts

I just installed a brand new alternator in my car. The output voltage is just above 2V regardless of engine RPM. The exciter voltage from the battery is A-OK. The previous alternator had the same ...
Dan's user avatar
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2 votes
1 answer
764 views

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 ...
MS JW's user avatar
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0 votes
2 answers
515 views

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://...
Rick T's user avatar
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0 answers
173 views

My Alternator Case to Battery Negative is reading 12 vdc and same for the Case to Positive side

just had tranny replaced last week. The alternator that was on the car had been replaced in May of this year. I drove car for at least 1000 miles since the tranny was replaced. But, last night the ...
JPNissanAltima2016's user avatar
0 votes
0 answers
115 views

Adding a ground strap from radiator to chassis

Does adding a ground strap from radiator to chassis reduce coolant voltage to almost zero? I have seen most cars have between 0.1 to 0.2 Volt of coolant voltage. I want to test it by adding a strap to ...
LFY MP7.3's user avatar
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0 answers
515 views

High voltage on downstream O2 sensor after driving, but low voltage on idle

After driving on the highway, my downstream O2 sensor voltage was a steady 0.8V, which is high. On the other hand, when idling before the drive, it was a steady 0.3V. Is it normal for the downstream ...
Asker's user avatar
  • 113
0 votes
1 answer
439 views

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 ...
Asker's user avatar
  • 113
1 vote
1 answer
142 views

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 ...
Gravey Baby's user avatar
4 votes
1 answer
304 views

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 ...
Robert S. Barnes's user avatar
1 vote
1 answer
820 views

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 ...
KIWIPOP's user avatar
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0 votes
1 answer
217 views

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 ...
James L.'s user avatar
  • 103
3 votes
3 answers
2k views

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:...
Moshe's user avatar
  • 153
4 votes
2 answers
828 views

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 ...
Lane 's user avatar
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2 votes
2 answers
4k views

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 ...
mariusmmg2's user avatar
3 votes
1 answer
1k views

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 ...
TMax's user avatar
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1 vote
3 answers
287 views

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 ...
NYCSteeler's user avatar
0 votes
1 answer
138 views

Can low battery voltage cause brake noises? - 2006 Civic

Driving a 2006 Honda Civic, right rear brake makes a clunking noise under medium to high braking. It sounds like the ABS but doesn't have the pedal pushing back like ABS does. Went to my usual ...
Chris's user avatar
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1 vote
2 answers
288 views

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 ...
A concerned basshead's user avatar
3 votes
1 answer
559 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 ...
Thibault D.'s user avatar
1 vote
0 answers
30 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 ...
ChaosPredictor's user avatar
3 votes
0 answers
2k 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 ???
David Diaz's user avatar
0 votes
1 answer
39 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 ...
sam's user avatar
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1 vote
1 answer
205 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 ...
Johnny Eckhardt's user avatar
2 votes
2 answers
205 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 ...
Vasiliy Sharapov's user avatar
4 votes
4 answers
74k 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 ...
hchc1992's user avatar
0 votes
1 answer
5k 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 ...
Shelby115's user avatar
  • 441
-1 votes
1 answer
106 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 ...
cnst's user avatar
  • 1,515
1 vote
1 answer
3k 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 ...
AMELIA SZCZERBA's user avatar
1 vote
1 answer
2k 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 ...
Cesar's user avatar
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0 votes
1 answer
51 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
user avatar
1 vote
0 answers
900 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 ...
Muhaha's user avatar
  • 11
0 votes
2 answers
772 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 ...
Wayne Smith's user avatar
1 vote
1 answer
128 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?
Kymnf.'s user avatar
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2 votes
1 answer
403 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 ...
ZBT248's user avatar
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0 votes
1 answer
211 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?
user avatar
3 votes
3 answers
67 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 ...
user avatar
1 vote
2 answers
196 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 ...
sjfklsdafjks's user avatar
0 votes
0 answers
263 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 ...
sjfklsdafjks's user avatar
0 votes
1 answer
2k 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?
Geremia's user avatar
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