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Problem installing musicman style pickup


bassituation
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Hi, I'm trying to replace the single musicman humbucker in a Fernandes Atlas with a Kent Armstrong MM4 I just bought. I'm not finding Kent's schematics very useful:
http://www.kentarmstrong.com/schematics/KA_Wiring_Instructions.pdf

The bass has a volume, tone and 3 way selector that operates front coil, both, back coil. I've managed to get the thing working by soldering white and bare to ground on the volume pot and the green to one of the selector points - this gives me a working pickup. But the selector is not working for it's usual 3 positions and I've been left with red and black wires with no home? Old fashioned touching the red and black on different terminals to see what happens is doing nothing?? I thought black was 'hot', does this not need to go somewhere? I wish the schematics said what each color represented?

Please see attached picture, would be grateful of any help. Ta.

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Well the bit I don't understand, is at the moment I have two white wires coming into the switch in the places where the red and green should go, do I join the red and green to those as the KA diagram suggests? Also the KA diagram points to an output and ground coming out of the switch but those are not coming out of my switch currently? This has left me confused.

Edited by bassituation
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If you take the 2 out put wires from the Seymour Duncan MM circuit and substitute those for the 2 wires from the pup in a normal P-bass wiring diagram, that will give you the tone and volume you're looking for.

SD do a good diagram if you look on the site

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