Questions tagged [voltage]
The voltage tag has no usage guidance.
67
questions
0
votes
0
answers
7
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 ...
- 101
0
votes
2
answers
49
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 ...
- 83
3
votes
1
answer
192
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 ...
- 133
1
vote
0
answers
78
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 ...
- 150
0
votes
1
answer
34
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
- 3
2
votes
1
answer
111
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 ...
- 83
2
votes
2
answers
272
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 ...
- 21
1
vote
1
answer
68
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)?
- 11
2
votes
0
answers
233
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 ...
- 141
0
votes
0
answers
263
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 ...
- 1
2
votes
1
answer
659
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 ...
- 21
0
votes
2
answers
439
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://...
- 103
0
votes
0
answers
146
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 ...
0
votes
0
answers
108
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 ...
0
votes
0
answers
478
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 ...
- 113
0
votes
1
answer
355
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 ...
- 113
1
vote
1
answer
128
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 ...
- 11
4
votes
1
answer
250
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 ...
- 15.7k
1
vote
1
answer
705
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 ...
- 23
0
votes
1
answer
185
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 ...
- 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:...
- 153
4
votes
2
answers
753
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 ...
- 41
2
votes
2
answers
3k
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 ...
- 284
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 ...
- 81
1
vote
3
answers
188
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 ...
- 11
0
votes
1
answer
134
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 ...
- 1
1
vote
2
answers
262
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 ...
3
votes
1
answer
461
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 ...
- 133
1
vote
0
answers
29
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 ...
- 111
3
votes
0
answers
1k
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 ???
- 31
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 ...
- 483
1
vote
1
answer
200
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 ...
2
votes
2
answers
169
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 ...
- 123
3
votes
4
answers
68k
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 ...
- 41
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 ...
- 431
-1
votes
1
answer
104
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 ...
- 1,515
1
vote
1
answer
2k
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 ...
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 ...
- 11
0
votes
1
answer
50
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
ahmed albalawi 818
1
vote
0
answers
830
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 ...
- 11
0
votes
2
answers
747
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 ...
1
vote
1
answer
125
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?
- 11
2
votes
1
answer
356
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 ...
- 77
0
votes
1
answer
206
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?
AIRMANBEAR
3
votes
3
answers
66
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 ...
Barry
1
vote
2
answers
195
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 ...
- 433
0
votes
0
answers
262
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 ...
- 433
0
votes
1
answer
1k
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?
- 207
0
votes
1
answer
31
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 ...
1
vote
2
answers
5k
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 ...