Proper Ground (grey wires) for Wurlitzer 200

[Allenm]

Hi, I noticed something today. As I was playing my wurly my friend came into my room and turned on the lights and somehow it affected my wurlitzer by creating an electrical pop sound. This wasnt happening before I worked on my piano. Does anyone know what may cause it?

I noticed that some of my grey wires are missing. Actually, on the treble side back and front there should be a grey cable connecting the reed bar to the amplifier. Well the back treble side is missing the cable but still has the ring around it. weird.

[Oregone]

It sounds like a grounding issue in the piano, and possibly your room wiring/fixtures.

[pianotuner steveo]

Have you checked your electrical outlet to be sure that it is properly ground? There are inexpensive testers that have lights that plug into outlets that tell you if the outlet is wired properly by turning on different lights in the tester. A 3 prong, properly grounded outlet usually cuts down on these issues. I've added the ground wire to early 2 prong models and attached the wire to the outlet cover screw, which is also ground, and it helped a lot.