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Reply to "installation of new gauges"

Simply ground the bulb socket, whether the light is visible or not, and your alternator will work again. Taking the bulb out will open the alternator field circuit & cause no charging, too. Weird charging circuit wiring is a Lucas trademark- Triumph & other mid-60s motorcycles have the ignition ground hooked through the tail light circuit, so if the light filament breaks, the engine quits!
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