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## What should the battery voltage be on a Jeep Grand Cherokee?

2 Answers. With engine running you should have about 14 volts at the battery terminals and about 12.5 volts when it’s off. Any reading much different, you should have the battery and alternator tested.

## How much is an alternator for a Jeep Cherokee?

Jeep Cherokee Alternator Replacement Cost Estimate. The average cost for a Jeep Cherokee alternator replacement is between \$584 and \$787. Labor costs are estimated between \$157 and \$198 while parts are priced between \$427 and \$589.

What should Jeep voltage?

Normal is 12.7+ as mentioned. You need at min 11.2-11.5 to be able to start ur vehicle. Any less and there just isn’t enough juice to turn the starter. Even tho vehicles have a 12v system, most of it operates between 9-14v.

What voltage should my Jeep battery be at?

With the Jeep off a battery should show roughly 12.5 volts. When cranking the motor, the battery should hold a voltage of at least 10.5, nothing less. If it is less your battery is run down, dead, bad, or it may be a bad starter.

### How do I know if my Jeep alternator is bad?

If the engine will run on a half dead 12 volt battery, it will run on a weak alternator. Simple test is to turn everything off except your low beams. Then turn the vehicle off and notice if the lights get dimmer. If they do, then the alt was putting out more voltage than the batt.

### What should a battery read while running?

When we take a closer look, we see car battery voltage can range anywhere from 12.6 to 14.4. With the engine off, the fully charged car battery voltage will measure 12.6 volts. This is known as “resting voltage.” When the engine is running, battery voltage will typically rise to 13.5 to 14.5 volts.

How do you read a car battery voltage gauge?

If the gauge is numbered and the engine is running, a reading of “12” on the gauge indicates a charging problem. The gauge should read above 13 volts and below 15 volts. Readings above 15 volts or below 13 volts indicate a charging system failure that needs to be addressed immediately.

What should my alternator voltage be when charging?

HOW TO TEST ALTERNATOR CHARGING VOLTAGE. Most alternators that are charging properly should produce a voltage of about 13.8 to 14.2 volts at idle with the lights and accessories off.

## How do I know if my alternator is bad on my Jeep Grand Cherokee?

A bad alternator can sometimes cause bearings to come off, which can cause a slight rattling sound. If you have been having issues with your vehicle stalling or not starting right away, this is a clear sign. Lastly, if the battery continues to die, the alternator may be the culprit.

## How many volts should an alternator put out?

between 13.9 and 14.8 volts
A good alternator should maintain battery voltage between 13.9 and 14.8 volts (14.2 is optimum). Even worst-case, with all accessories turned on, there should be at least 13 volts at the battery.

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. Verify this number with the part manufacturer, if necessary.

How many amps is a standard alternator?

65 to 100 amps
Most factory alternators are rated at 65 to 100 amps and are capable of handling your vehicle’s basic necessities, such as headlights, gauges, fuel pumps, A/C, etc. These alternators also typically come with a 10 to 15 percent reserve to handle additional accessories.

### What should my alternator be charging at?

The “normal” charging voltage on a typical application might be 13.9 to 15.1 volts at 77 degrees F. But at 20 degrees F. below zero, the charging voltage might jump as high as 14.9 to 15.8 volts for a short period of time. On a hot engine on a hot day, the normal charging voltage might drop to 13.5 to 14.3 volts.