Questions tagged [voltage]
The voltage tag has no usage guidance.
21
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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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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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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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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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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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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