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I wired up a seymour duncan on my mustang and I ran into a grounding problem.
Here is a pic of the pup wired now. Can anyone tell me whats wrong by looking at it?

do you see how on the top right and bottom left lug, there is small jumper wire from the lug to the switch? there should be a connection between that and any part of the metal on the outside of the switch, do you have both of those?

there isn't a jumper on the switch thats running the SD. That makes sense now because the switch had been replaced before I bought it.
Now I gotta find a homemade jumper lol

just take a piece of wire and strip it and use it. you could even use some from a pickup lead if you don't have any.

Same problem still

Multimeter - check continuity on all your ground connections including your bridge

Joey wrote:Multimeter - check continuity on all your ground connections including your bridge

tru dat. another "tricky" spot in the mustang is the small wire that should go from the bridge to the control plate w/ the knobs. If that moves and doesn't make that connection, you'll have grounding issues.

Did that too, grounded to the post @ the bridge.
I wonder if the toggle switch is bad, it was replaced before I got it

jonl wrote:Did that too, grounded to the post @ the bridge.
I wonder if the toggle switch is bad, it was replaced before I got it

shielding
shielded wires
try a switchcraft switch.

Those are switchcraft...