Buzzing from speakers on TT rig

Thanks Ralph.

On the Marantz unit the rcas and ground that would normally be be replaceable at the back of the unit go all the way to the phono pre through the tone arm into the cartridge. I’m looking this up and not coming up with anything for a replacement if needed. I’m calling it tt15s1 wire set and tt15s1 cartridge wiring? Something else I should be calling it? Guessing I need to try and call Marantz. 
 

I’m going to disconnect and reconnect the 4 cartrdige wires and re seat nice and tight. If that does not do it I guess try and order a new “wire set”? Seems really strange something in the wiring would go bad or break when the unit is just sitting there. 

. If that does not do it I guess try and order a new “wire set”? Seems really strange something in the wiring would go bad or break when the unit is just sitting there

@mofojo Again, try a putting a wire from the base of the arm to the phono preamp ground and see if that fixes it. If it does then you would simply make that connection more permanent. I've been doing troubleshooting since the 1970s; one rule of troubleshooting is its not worth it to speculate why something has failed when you know it did. Just fix it and move on :)

Ok Ralph I tried your above suggestion and it made no difference. 
 

When nothing playing and the volume is turned up a bit there is a descent amount of static through the speakers. If I touch the base with 2 fingers it knocks it out completely as long as I hold my fingers there. Buzzing when touch of run fingers down the tone arm when it’s parked. Definitely seems like some kind of grounding deal but I’m at a loss. 

@mofojo Sounds like the arm tube isn't properly grounded. Try running the wire from the chassis of the phono section to the arm tube itself.

Have you used an ohmmeter check continuity from tonearm to ground wire lug?