alternator problem

[blowthemup 10+ year member]

My voltage is randomly jumping all over the place, 13-16v. I would say its the alternator going out but the alternator guy is saying it sounds like a battery problem. My XS power batteries are only two years old so im sure they got plenty of life left in them. Is it the batteries, is it the alternator? The alternator also makes a humming sound even when the car is off and parked/locked. Doesn't seem right to me especially since these problems didn't exists when the alternator was new and I haven't changed anything to create the problem.

What do you guys think, whats the bad piece in the equation?

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[Massive spl]

Sounds like the regulator in the alt is bad

 

[blowthemup 10+ year member]

Sounds like the regulator in the alt is bad

Thats what I was thinking also, I mentioned it and he said sounds like a common battery problem. I keep my batteries on a charger quite frequently and there not that old so I dont think its them. How hard is it to change the voltage regulator in one of these things? Would going with an external voltage regulator be more reliable?

 

[BoogerMan]

Yeah I'd say the regulator as well. When my alt regulator was going out it was doing the same thing. That you described. At idle I was at like 14.5v and at 2-3,000 rpms it would jump up to 17v.

 

[blowthemup 10+ year member]

Would an external voltage regulator be more reliable?

 

[blowthemup 10+ year member]

Does anyone else with a Singer Alternator have any noise coming from it when the car is off/key out of ignition. Gonna try and get some video of the voltage jumping around and maybe the noises its making if my phone will pick it up.

Sorry about the bad video quality, filming/driving stick inst easy but you can make out the voltage just fine.

voltage jumping around https://www.youtube.com/watch?v=f9uPs-ScpZU

noisy alternator at idle https://www.youtube.com/watch?v=GjQd_BJ5OGM

 

[blowthemup 10+ year member]

BUMP....updated with videos!!!! Thanks for the help guys and any opinions are appreciated //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[A_Contraptions]

that noise is the resistance a high output alternator has that would usually not be heard from stock as it couldnt make that power at idle. the noise is resistance in the stator against the spinning rotors magnetic field

 

[The Camry]

So how do u fix it

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[A_Contraptions]

So how do u fix it
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the noise?

 

[The Camry]

the noise?

Yea. It does seem to be that guys issue

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[A_Contraptions]

the noise is normal. its pulsing in the video because his voltage fluctuation causes resistance change in the alternator causing swing in load on the engine.

 

[The Camry]

the noise is normal. its pulsing in the video because his voltage fluctuation causes resistance change in the alternator causing swing in load on the engine.

And swinging load is normal? Cuz I feel like its not..

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[A_Contraptions]

And swinging load is normal? Cuz I feel like its not..
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swinging load no, thats why i asked if you were referencing the noise when you asked how to fix it as the noise he asked about it normal

 

[mylows10 5,000+ posts]

Might need a sense lead adapter