June 25th, 2012, 10:57 AM
I wired up a phase switch in my tele and have a ground issue--I guess that's what it is at least.
When the switch is engaged and the selector switch is in either the bridge or middle position, there is a humming. It's worse when I put my hand on the bridge. Any ideas what I've done?
(to compound the issue is the extra wiring from a boost circuit I put in there, although the boost works fine with no hum)
June 25th, 2012, 11:09 AM
Here's a shot - You switched the hot and gnd leads on the bridge pickup. The pup has a ground wire soldered to the original neg. lead that electrically connects to the bridge. This needs to be disconnected and independently sent to the back of the volume pot. The way it is now, your metal parts (bridge, strings) are in the signal path. Usually when you touch the bridge the noise goes away but in your case it gets worse.
June 25th, 2012, 11:13 AM
He's right you know, but it more normal to do the same trick with the neck pickup.
Both allow the base or case to be grounded whilst allowing the pickup to be phase flipped or put in series.
June 25th, 2012, 01:31 PM
Thanks for the tip. I'll check it but I don't recall this particular pup having a base plate.
June 25th, 2012, 05:44 PM
You probably have a ring terminal on one of the height adjustment screws that is tied to the pickup ground. I bet you'll need to have separate ground wires for the pickup and the bridge plate.
June 27th, 2012, 01:38 AM
waparker4, your diagnosis was spot-on. It was a slight pain in the butt to get the bridge off but when I did, I spliced that wire with another and ran it to the back of the pot. Bingo!
Thanks guys for your help. :cool: