CEC Industries EF30AL Electronic Wig-Wag Alternating Flasher Relay, LED Compatible, 3 + Ground Wire Prongs, 12 Volts

3-Prong LED-compatible Wig Wag Flasher This flasher has 3 prongs.The prong marked must be connected to the 12 Volt (battery) through a switch, the other two prongs are connected to the bulbs. It can be used with LED bulbs and/or regular incandescent bulbs.IMPORTANT #1: It is important that the X prong be wired to +12 Volts through a switch. If you don't, it will click and flash your lights ALL THE TIMEIMPORTANT #2: If your vehicle is wired for a "regular" flasher, you cannot simply plug in an alternating flasher and expect it to alternativey flash front and rear, or left and right. If that's what you're looking for, additional wiring is required.Replaces Carquest FSHEF30A Please review the specifications for suitable wiring harness.