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Try the cables from your battery and alt. Sometimes these can corrode.

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Q: Battery has been replaced and alternator is good why does truck still loose power?
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Related questions

What can be the reason for a car to loose electrical power?

The alternator might not be charging the battery


You have replaced your starter alternator battery and battery cables on your Saturn why is it still losing power?

Voltage Regulator?


Why does your battery keep draining on your 2000 Chevy Monte Carlo?

Defective alternator, loose alternator drive belt, dead cell in battery, or something is on pulling power from the battery.


Why will your car not hold a chare after you just replaced the alternator and battery?

A light is on or a relay is stuck pulling power from the battery.


Why won't your battery stay charged?

Defective alternator, dead cell in battery, something on pulling power from the battery when the vehicle is idle, corroded battery cable connections, or loose alternator drive belt.


What does it mean when your car squeals and you just put a new car battery in it?

nothing to do with the battery it is probably a loose alternator belt or power steering belt


Is my alternator for a 1990 Volvo if when you take the positive cable loose and it cuts off or could it be the battery?

all alternators require battery power to operate.


You replaced your alternator but your car still lost power?

Have the battery checked out. It may have a dead cell and not holding a charge,


What is wrong when a car loses power and cuts out?

Either your battery is dead and wont accept a charge or your alternator has stopped charging the battery due to a blown fuse, loose or damaged wiring, loose or broken drive belt or the alternator itself has gone bad.


How car battery produces the power?

A battery does not produce power, it just stores power. The alternator produces the DC voltage the battery stores. As the power is taken from the battery it is replenished by the alternator.


Why is your battery light on?

Indicates a problem with the electrical charging system. Can be a bad battery, alternator, loose alternator drive belt, corroded battery connections, or ground connections. Normally this would indicate a problem with the alternator but not always. Most auto parts stores will check the system free of charge, if you buy the repair parts from them, which would only be appropriate.


Do alternator your make the car start?

No, your battery supplies power to the starter. However if your alternator is defective then it will not supply power to the battery and the battery will soon be depleted.