Buzzing noise near under hood fuse box

PAULMREID

MEMBER
2004 GMC SAVANA
5.3L
V8
2WD
AUTOMATIC
250,000 MILES

Something near my under hood fuse box just started making a buzzing sound all of a sudden the other night when it hadn’t even been running for several days. The only way to stop it was disconnecting the battery.
What should I start looking at?

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,765 POSTS

Hi,

That's a tough one. Is it possible for you to record it and upload the sound for me to hear? Also, what I would do is open the fuse/relay box and touch the relays to see if you feel it. If not, remove one fuse at a time to see which fuse stops the sound. At that point, we will have at least identified the circuit.

I attached a pic of the fuse box and the legends identifying what each fuse controls. Try that and let me know what you find.

Joe

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Thursday, May 28th, 2020 AT 8:08 PM

PAULMREID

MEMBER
2 POSTS

Thanks Joe,

I reconnected my battery yesterday but the noise or chattering was gone.
At the time this happened we had just had a lot of rain for days. Could high humidity cause a small short in a relay and then dry out and be okay again. If it happens again I will try to get the sound recorded for you.
I’ll be in contact if it continues.

Thanks again,
Paul Reid

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Sunday, May 31st, 2020 AT 9:35 AM

JACOBANDNICKOLAS

MECHANIC
109,765 POSTS

Hi, Paul.

Honestly, anything is possible. Let's just hope it's gone for good. Regardless, if it does return, let me know.

Take care of yourself.

Joe

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Sunday, May 31st, 2020 AT 7:09 PM