Buzzing noise near under hood fuse box

2004 GMC SAVANA
250,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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PAULMREID
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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?
May 28, 2020 at 1:57 PM
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JACOBANDNICKOLAS
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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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May 28, 2020 at 8:08 PM
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PAULMREID
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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
May 31, 2020 at 9:35 AM
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JACOBANDNICKOLAS
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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
May 31, 2020 at 7:09 PM