Epiphone SST humming noise - Epiphone SST Studio Guitar Acoustic

Hum is usually a bad ground, probably caused by a bad plug or jack

It gets a little involved, I would recommend a simple book from say amazon, or google basic guitar wiring. Take an extra couple minutes and apply aluminum foil or adhesive metal tape where you can inside any cavities, then ground it. You'll reduce hum. Use good shielded wire. Practice soldering techniques, a cold solder joint will make the whole project flop.

Simple answer is yes.

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Make you a hook out of a coat hanger. Get inside and hook the wiring to the jack, take the nut off the jack and pull it up through the F hole. You can plug in to it a patch cord so you can pull it back through once fixed. Check out Guitarelectronics.com for a wiring diagram.

Sounds like you are using incorrect settings on the amp you are using. Try all tone controls at 12 o'clock as a start. Excess bass boost is a good way to have the problem occur. Also back off the volume control. "Handling" noise or scratching from handling the guitar is NORMAL for this type pickup. Back down the volume and DO NOT boost the highs or lows to help with the handling noise problem.

YOU CANNOT CONNECT IT BACK , YOU CAN CONNECT IT BACK ONLY IF YOU TAKE THE WHOLE GUITAR APART.

change the cable wire connect the negative line as a ground