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put a volt meter across the battery, engine stopped must be over 12v. rev the engine to 3-4000 should rise to about 14v, this will show the charge system is working Some batteries only last 12 months or so. if it is a couple of years old buy a new one, the gel ones seem to last longer
IF the bulbs are good, you have lost power or ground to one or both left bulbs. Use a voltmeter to check for 12vdc at the plugs with bulbs removed, switch on left blinker engaged. Then use the meter on the ohms position, with key OFF, and see if you have a circuit from the ground wire end in the bulb socket to a good frame ground on the bike. You probably have a loose, dirty, or corroded ground circuit somewhere.