What's this wire for? - Blast MS-2930 - always been disconnected

[tDRG]

What is this orange wire that looks like it should connect from the main board of the chassis on my MS-2930 to the smaller vertical board? I think it's been disconnected the entire time I've owned this cab. It was definitely disconnected in the pictures I took when I first pulled the monitor, and I didn't reconnect it after cleaning. No problems with the video at any point. The chassis had been recapped before I got the cab.

Google translate says the text reads "Be careful of high pressure," but I assume it's really voltage. Should I plug it in?

 

[kayzp4ul]

I want to say it's a grounding wire that grounds both boards together.

 

[Thomas]

Yes, "high voltage". It should be plugged into the metal thing that it's hovering next to (after unplugging and discharging the tube of course).

 

[tDRG]

Cool, thanks guys. Yeah, maybe ground, maybe HV feedback or something. Definitely should be plugged in, so I've done so. Still no problems with 15KHz games after reconnecting.