# Can a car battery have good voltage but no amps?

Contents

## Can you have voltage but no amps?

If you have a condition of less than full voltage output along with no amperage, you may have a failure of one or more components within the rectifier. These causes are difficult to diagnose without more information but may include: blown diodes. blown SCRs.

## Can a car battery have 12 volts and still be dead?

Yes, a battery can show 12 volts and still be bad. There is a lot attached to the volts your car battery or any battery shows. It indicates if the battery is good or bad, plus the volt could let you know the battery’s charge.

## Can an alternator put out volts but no amps?

Alternators can make Volts with no amps. The best way to have it tested is to take it to a shop that can measure it’s output, there is a testing setup made for this that puts a load on the Alt.

## Will a car start with only 10 volts in the battery?

As soon as the car is turned on, the voltage reading will drop for a quick moment, but should not fall below 10 volts. If it falls below 10 volts, it means the battery does not have sufficient turnover strength and is prone to failure.

## Why I have voltage but no current?

There can be voltage without a current; for instance if you have a single charge, that charge induces a voltage in space, even if it’s empty. Voltage, in the most physical way, is a scalar field that determines the potential energy per unit charge at every point in space.

## Why a circuit can have only voltage but no current?

It is the force that allows electrons to move from one point to another. If the voltage is absent, those electrons cannot move between points in a circuit, which means that the current does not exist.

## Is 11.9 volts enough to start a car?

When the voltage of the starting power supply is lower than 11.8V, it will be difficult to start the car. You can choose to turn off all other electrical appliances and try several times. When the battery voltage is lower than 10.8V, it is generally impossible to start the car.

## How can you tell if a 12 volt battery is still good?

If the battery is good, the reading will be higher than 12 volts. It will hit the 12.8 volts if it is fully charged and 12.1 volts if it is about 50 percent charged. If is it about 11.9 volts or lower, this means it isn’t charged.

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## At what voltage is a 12v battery dead?

12.0 volts or below – At 12.0 volts your battery is considered to be fully discharged or ‘flat’ and should be recharged as soon as possible. The lifespan of your battery will be severely affected if it remains within this voltage range for extended periods of time.

## How do I check my alternator amperage?

Start the vehicle and hold the engine at around 1,500 rpm. With the engine held, the carbon pile can simulate an electrical load. Alternator output should increase, and the ammeter reading should register close to the alternator amp rating.

## When the alternator voltage is less than the battery then the?

The output voltage of an auto alternator is normally fixed at a preset voltage in the range of 2.2 volts per battery cell to which it is connected. So if the battery voltage is reduced by heavy usage (discharge) then the current produced by the alternator will be increased, and vice versa.

## How do I know the amps of my alternator?

Look for a diagram under or near your fuse box cover. It will have individual amperage numbers (sometimes along with volts) already set by the manufacturer. Add up those numbers to find what amperage your alternator needs to feed the car’s electrical system.

## At what voltage does a car battery need to be replaced?

Your owner’s manual will give you a clearer understanding of where your battery voltage should be, but in most cases, you’re looking for approximately 12.6 volts. A battery might need replacement if its volts suggest it’s gone bad. As your battery ages, it loses its capacity to hold an electrical charge.

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## How many volts does a car starter need?

You can test for proper cranking voltage with a voltmeter while—you guessed it—cranking the engine. The several hundred amperes of current the starter motor draws should pull the battery voltage down to a normal 9 to 10 volts.

## What voltage is too low for car battery?

What voltage is too low for a car battery? A car battery is dead if its voltage is anything between 11.75 and 11.89 volts. Any reading between that range means that the battery is no longer functioning and a car owner should consider a replacement.