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Automotive electricity

Chevrolet 98 Blazer Alternator

Gregorio829
hace 5 años
hace 5 años
Hello friends, my blazer alternator has an unstable voltage of 12.8V to 13.4V and sometimes it reaches 11.8V. already disconnect all cables, clean them and follow the problem.
celentauro
celentauro
3.878
hace 5 años

If you charge the battery, you don't have to worry about the voltage you are delivering at any given time.

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Gregorio829
hace 5 años

The battery is 12.6v and is normal, the other thing is that it does not turn on when it is working, it works normally but what worries me that it drops to 12.9v.

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Ennio Montenegro.
hace 5 años

Where do you measure the tension .. ???

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celentauro
celentauro
3.878
hace 5 años

Accelerate the engine and see how the delivery passes the 13 volts.

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Gregorio829
hace 5 años

I measure the direct voltage in the battery and accelerate it to 2000rpm and go up to 13.4v then go down to 12.7 or less and it is very unstable. That alternator has 8 years with me and before I delivered 14.2v these days I measured it and it was stable at 13.4v and well now it is unstable.

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celentauro
celentauro
3.878
hace 5 años

You have to take into account the state of the battery, if you are more than 3 years old it may be low and you want a change.

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JulioCesarTorres
hace 5 años
hace 5 años
I had a problem like that, I was at the alternate point to the voltage regulator, the welding had taken off, resolved and the fault disappeared
Gregorio829
hace 5 años

Right now I will disassemble it to see what fails I see it. and thank you all for wanting to help me friends.

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Ennio Montenegro.
hace 5 años

Discard problems of poor contact in the battery when measuring.
A possible fault is a wear of the brushes.

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electrostorm
electrostorm
2.622
hace 5 años

You have to check diode holder plate carbons rotor rings that are smooth regulator check all welds the load must remain stable if it is stable your lights will go up and down

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Ennio Montenegro.
hace 5 años

If the voltage at the battery terminals reaches 11.8V, it may be due to bad contact. Otherwise it should not drop below 12.5V unless the battery is bad.

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Gregorio829
hace 5 años

Friend, I corrected all the welding of diodes and the regulator, now it is maintained at 14.0va 2000rpm and at 1000v it lies at 13.8v. It is an acceptable margin. Thank you for your suggestion, very grateful friend.

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