First buy a digital multimeter
Next, have some one teach you about this tool.. This is a lifetime tool for the balance of your life. Often with large equiptment there is a single flasher. Some times these large yellow flashers will flash the emergency lites while using the turn flashers. Carefully make a drawing and record where every wire color attaches. Please note wire colors and wire gage. Take at least 5 cell phone pics. Now remove all the wires from yellow flasher. Connect a two terminal flasher to a 12volt source and the left turn lites. If lites flash disconnect the 12volt source and connect to the wire from the turn switch with the key on. Through deduction the other wires can be connected to new flashers. one flasher left and one flasher right. The emergency lites need a seperate flasher. Use the multimeter to discover 12 volts and any grounded wires. If none of this works check the bulbs to determine if lamps/bulbs will lite.. This is fun...... Frank
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