Crackling noise on Fender Marcus Miller
An intermittent crackling noise is coming out of my Fender MM, it seems to be happening more frequently. It's not the instrument lead because I have plugged a few leads in including my best one which I gig with, and the same thing happens. The noise happens even when the bass is perfectly still with no movement on the jack etc. which is why I also don't think it's the jack. The same leads are used on other guitars and no prob.
I am certain it has something to do with the preamp or the preamp switch, because when I cut the toggle switch to passive, there is no noise. A friend suggested it might be interference to the preamp when it is active, from a fridge or similar. But I have had the bass a while now so why would that just happen now?
Can anyone give me a tip on how to test the preamp and wiring between jack, preamp (model FMEQ 080097) etc with a multimeter? Comparing the wiring with a Marcus Miller IV wiring diagram - it visually seems fine, with everything in place and nothing loose.
"That thing is so powerful it needs a safety catch" MIM Fender P-Bass Club #136; Fender J Bass Club#727