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Re: JD 2010 Diesel - What is this switch?
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I doubt it is factory so you will probably not find it in any manual.
It sounds like this is not a momentary switch. Does it stay on with out holding it in the on position, keeping the electrical system live, as I understood your previous posts?
The electrical should be turning on and off with the ignition switch, or other factory switch based on the circuit. Along with your descriptions it appears you have several none factory switches, so these are indications it is likely the wiring has problems to me. It really sounds like you need the manual and to rewire your machine correctly.
Most master switches were inserted into a battery cable circuit, often the ground cable to de-energize the entire electrical system. Most reliable ones are rated to take the surge amps of starting, which would be more than 250 amps (go for the higher ratings). I can't say what yours might be without seeing the terminals and wiring to it. Often master switches had 3/8 terminals and a battery size cable on each terminal so the switch could interrupt the current flow through that cable (either ground or hot depending on which cable it is in). It sounds like yours has been installed in the primary feed wire to the accessories, bypassing the correct ignition and factory switches.
The amp rating needed for a master switch will depend where and how you wire it in the circuit. If you just want to shut off accessories 100 amp continuous rating should be fine. To go in a battery cable, look for a master switch like the ones from Pollack or Cat. They will have switches with the heavier cranking/inrush amp ratings to handle starting motors and will handle continuous duty when not cranking.
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