Questions tagged [voltage]

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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 ???
2
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1answer
356 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 ...
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0answers
123 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 ...
1
vote
1answer
30 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 ...
1
vote
2answers
81 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 ...
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0answers
28 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 ...
1
vote
1answer
129 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 ...
1
vote
1answer
1k 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 ...
1
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0answers
400 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 ...
0
votes
0answers
20 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 ...
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0answers
11 views

Steady, low voltage on pre-cat O2 sensor while idling, but voltage increases upon revving

To test my pre-cat O2 sensor, I unplugged its connector from the ECU and stuck a voltmeter’s probes into said connector. When I let my engine idle, my voltmeter shows a steady low voltage, oscillating ...
0
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1answer
57 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 ...
0
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2answers
567 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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0answers
237 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 ...
-1
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1answer
91 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 ...