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The 72 still used that goofy huge switch with about five different poles, most with two blade conectors, if it's stock.
Use an ohmmeter and make a chart, a grid. Along the left side, each row should represent the switch position...O for off, 1 for first postion (or ON if only an on/off switch). Then in columns label across the top with the poles which you have numbered on the switch. Note which ones are connected to each other in each position by putting an X in the box where the row and column intersect. Then look at the pattern. It should tell you what's up. In the off position there should be at least one terminal which is isolated from all the others. This would be the hot lead. If it's a two position switch, then all the others would be connected when the switch is ON. If it's a three position switch....on off lights or acc....then in the first postion, those things which work when the igntion is on, but lights are off, like brake light, idiot lights, horn, etc., would be hooked to the first position poles, and the lights to the second position poles.
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Triumph old, Triumph new, any Triumph will do.
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