Electrical noise with low boost pump on

[dkkim73]

Hi All, 

Saw a thread on boost pumps and thought I'd ask about something I've noticed the whole time I've had the plane: 

With the low boost pump on (indicated for certain conditions and altitudes) I heard some static-y electrical noise over the intercom. 

Does anyone have any info on this? I can certainly imagine a motor might be noisy, though I suppose it could also be a connection or switch. Curious if there are high-likelihood places to start. Not a show-stopper, but something I've been meaning to look into at some point.

Thanks!