Confirming alternator going out ??

[BullElk]

Battery light came on while driving. When parked with engine running the battery was 9.? volts. Turned engine off, battery and alternator increased to 12. ? volts but will not crank without jumper. Both alternator and battery reads the same. Alternator does not increase voltage at all. I repeated the same process with another battery as well. No broken or slipping belts.

Bad alternator?

Thanks

 

[Godwin]

Yeah, and may only need a new set of brushes which are cheapish and easy to replace. From Partsouq:

 

[BullElk]

Is this what your mean that warrants the problem and replacement ?

Also, is there a safe way to clean the alternator ?

 

[vipergrhd]

I would test the rectifier if that's ok a new brush may buy you some time but it looks like it's on it's way out. Being oil soked doesn't help either.

 

[BullElk]

I would test the rectifier if that's ok a new brush may buy you some time but it looks like it's on it's way out. Being oil soked doesn't help either.

Don’t know how to do that but I did probe the middle and one side prong and got 11.76 ohms set on 20k. No other prong connections showed anything.

 

[vipergrhd]

Don’t know how to do that but I did probe the middle and one side prong and got 11.76 ohms set on 20k. No other prong connections showed anything.

Look it up on YT. Need a Volt/Ohm meter.

 

[Marco Lau]

When one dies, usually the other will go usually not far behind...

 

[nickolai]

Maybe its just me but I'd consider that amount of wear as too far gone.

 

[BullElk]

Look it up on YT. Need a Volt/Ohm meter.

I used Ohm meter and tested what I think were 8 dioded and they all read 495-500ish ohms. From what I am seeing, that means its good. I already have new OEM brush thingy on the way.

 

[BTLSHP]

This is precisely where today's trouble with the Harmonic Balancer began for me. You may want to look into the Denso replacement for the copper contact surface - Slip Ring. That top surface looks much more deeply worn than mine was today. They are under $20. Like mine the black on the copper suggests they were arcing.

 

[simple]

Oil goes in the engine, not ON the engine

 

[BullElk]

Oil goes in the engine, not ON the engine

That was from many moons of power steering ATF. Its all good now.

 

[BTLSHP]

That was from many moons of power steering ATF. Its all good now.

Power steering pump was last week's project.....

 

[BullElk]

New OEM brushes and a dose of QD electronic spray and good to go another half a mil.

 

[landtank]

Sure