Question about Marshall Amplification Marshall Footswitch for MG100HDFX and MG250DFX

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I have a Marshall channel/dfx footswitch. The jack plug has been chopped off leaving me with a red, blue and yellow wire. Can you tell me where each one is soldered to on a replacement stereo jack plug? Thanks so much

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NEVER trust colors... with an ohmmeter you can tell which is the common lead by testing... find the lead that has continuity to EITHER switch independently... It is PROBABLY the blue one... this will be the "sleeve" of the plug. The schematic documentation is so bad the jack wiring cannot be decipered as to which contact is the tip and the ring. HOWEVER once you find the common of the switches and connect it to the sleeve you have only two choices for the other wires so just try them.

You can also take the back off the pedal to find which color goes to BOTH the switches... connect that one to the sleeve. Try the other two wires for proper operation before final soldering.

Posted on Apr 11, 2011

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TRS: Tip - red, Ring - blue, Sleeve - yellow

Posted on Feb 24, 2013

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The schematic shows it as a standard 1/4 inch stereo plug. Wire the ground common to both switches (Channel and DFX), the ring to one switch and the tip to the other...I.E. ground (sleeve) to ring for one switch and ground to tip for the other. You'll have to experiment with which switch operates what function and label them accordingly.

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