Where is the alternator fuse - 2003 Chevrolet Avalanche

Fuse Box Diagrams

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Alternator Wiring

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Yes, if the alternator fuse is blown, it can cause the alternator to appear as if it's not functioning properly when it's actually fine. The alternator fuse is a critical component of the charging system, as it protects the alternator and the rest of the electrical system from overloads and short circuits.
When the alternator fuse blows, it interrupts the flow of electrical current from the alternator to the battery and the rest of the vehicle's electrical system. As a result, the alternator cannot charge the battery or provide power to the vehicle's electrical components.
If you suspect a problem with your alternator but the alternator itself tests fine, it's a good idea to check the alternator fuse and the associated wiring. Replacing a blown fuse can often resolve charging issues and restore the proper functioning of the alternator and charging system.

You can find a selection of replacement fuses in the fuse box. Sometimes, they are located on the inside of the fuse box cover. Replace the alternator fuse by pushing the new one into place using your fingers.

https://itstillruns.com/replace-alternator-fuse-7608082.html

There on two fuses for the alternator 175 amp under the hood fuse box. And an inline fuse from the alternator to the battery.

Bad alternator or short in alternator wiring. You much need a wiring diagram. Is that the car? Was in an accident? You may have pinched wiring or a wire shorted to ground. Try new fuse with alternator disconnected, then with key on, connect alternator-watch for sparks, or clicks, -you might want to have the alternator tested, just to be sure. You have to start somewhere...
Maybe a wiring short in the blinker system? Or is the fuse blowing an alternator fuse?

The alternator fuse is screwed on from the bottom up inside the fuse box. To remove the alternator fuse, you have to unscrew the whole fuse box from the car and on the bottom of the box are more screws to open the box. Once its open you will see one or two little screws holding the alternator fuse in place, easy. Unless you buy the manual for the car, you'll have to break one to pieces trying to get it out, to figure out how to do it, like i did.

There are fuses in a car, and only one alternator, there is no such thing as a fuse alternator.

Usually that fuse powers the alternator and the fuse box.
It would have to be a big short to ground to blow that fuse.
Its possible the main wire to the alternator is touching a metal spot, or the alternator is shorting out inside when it is running.
What is draining the battery may be something else, or the battery could be discharging after the fuse blows if the alternator is not charging it.

You may find a blown fusible link or burnt wire/bad connection at the starter large terminal.I would start the car and check voltage output at the alternator output terminal first in case it's just a bad alternator.If you have 14+ volts at the alternator output terminal,you could also just run a 10 gauge wire from that terminal to battery positive directly and disconnect the alt feed to the starter terminal.

the fuse box under the hood is known as the (BJB) that is where you will find fuse for your alternator
location number for the fuse is F1.10 it is a 1amp fuse, there is another fuse which is an inline fuse, most likely the one your looking for 175amp location it does not specify, but red wire comes from the battery to the starter motor, from the starter motor to the alternator, the inline fuse is in the wire from the starter to alternator, there is n location for it, but easiest way is to check for voltage at the alternator, as inline fuse will be close to there, so if your there, just check at alternator for voltage
sorry it is not located in fuse box and the fuse for alternator in fuse box control the light on your dash

good luck, if i can help any further just ask

Thanks
Jay