Slow Blinkers need help!

There are a few things to check. First check the battery voltage, with car off after a recent start. It should read about 12.7 volts. Then start and measure the battery voltage, it should be between 13.8 and 14.5 volts and may vary with temperature and voltage drops. Also measure the voltage at the blue wire at regulator with other lead at ground. It should be perhaps 0.3 to 0.5v less than battery voltage.

Since the flasher is a thermal device it need a certain electrical load to work. This means all bulb elements and connection must be good. First check that all front and rear signals and tail lights are working, and brake lights. Often is a bulb is bad, the flasher is low on one side. There are heavy duty flashers, they are designed to work with added loads of trailer lights. They may not always work or be slow to blink in non trailer application.

The brake lights and turn signals share the same bulb filaments on a dual filament bulb. They draw more current and put out more light than the tail or running lights. If a bulb is forced into a socket incorrectly, or wiring is swapped or incorrect bulb, there can be a blinker problem.