Yes there are two flashers. One for the turn signals, one for the flashers. First, do all of the turn signals and brake lights work? The front and rear turn signals, and brake lights are the same bulbs and wires from the turn signal switch. The turn signal switch separates all 4 corners of the car. Left and right, as well as front and back. You don't want brake lights in the front.
The brake light switch feeds the turn signal switch. The flashers just connect all four corners to the 4 way flasher at the same time. Also part of the turn signal switch.
If the turn signals work front and back, the wires and bulbs are good, and so is the fuse and t/s flasher.
If the brake lights work, the brake switch and that fuse is good.
If the 4 way flashers don't work at this point, the flasher unit may be bad. Either that or you have a bad connection from the fuse to the flasher, or to the t/s switch. If everything else is good, the t/s switch is bad.
The 552 flasher does not require a fixed load to operate, so it is used in the 4 way flasher. It can be used in the turn signals.
Turn signal flashers are designed for a given number of bulbs. So if one bulb burns out, the flasher won't flash and warns the driver of a problem. It will also flash too fast if an extra bulb is added, such as connecting a trailer. The 552 will flash if only one bulb works. It will also flash the same if more bulbs are added. It doesn't care what the load is. They are often used in the turn signals when a trailer hitch is added. It is used as 4 way so they work even if one bulb is out.
Ken Styer
