Is it my alternator?

[addkev]

I have discovered a new sound, it sounds like a low humming (almost like a distant fog horn) when the truck idles, as soon as I give it gas it goes away. The first start of the morning it will actually kill the truck after about 2 seconds. Then I start it up and it is good (still humming but it will run). As soon as it is warm there is no sound. When I start the truck at lunch or after work there is no sound, only in the morning.

I am thinking it is the alternator bearing going bad.

What do ya'll think?

 

[dogfriend]

Are you sure it isn't the IAC valve? I think that a lot of people have reported humming from the IAC.

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Also, some trucks have a low pitch noise coming from the trans (mine included) there is a TSB on this:

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[John G]

Sounds to me like your fuel pump is on the way out.

 

[Robb]

Sounds to me like you are hearing things cause it is 1:20 in the morning and you are drunk celebrating your BIRTHDAY! J/K I have no idea.

HAPPY BIRTHDAY!

Robb

 

[addkev]

HAPPY BIRTHDAY!

Thanks, Robb.

Sounds to me like you are hearing things cause it is 1:20 in the morning and you are drunk celebrating your BIRTHDAY!

You gotta remember I am in Hawaii, I had just got home from work. But you can bet, I'll be stumblin' and muttin' complete and total nonsense tonite!