Why does my hazard fuze keep blowing?

Question: Why does my hazard fuze keep blowing?

Answer: There is a short in the circuit somewhere. It could be a bad light bulb, a bulb socket, a wire rubbed through, a bad switch...something. Don't give up, you are bound to find it sooner or later.

Solution:

Connect the bulb / circuit tester where the fuse connects, and then let the short hunting begin. When the light bulb goes out for the change made in the circuit, the short is then found. Make the repair, and retest. When the bulb stays out, the problem should be gone. If you want to stick with using the multi-meter, connect one lead to the fused side of the flasher circuit, and the other end to a good ground. Set the meter to read continuity...ohms. when the short is eliminated, the meter should show an open circuit. Either method should work.

Hi,

Here’s a composite image taken from the 1997 Mazda Miata service manual showing the wiring for the hazard lights and the high mount brake light (3rd brake light)

Check that the green wire from the high mount brake light only connects to the green wire that connects to the other brake lights and also the brake pedal switch. The other side of the brake lights should have a black wire connected to them. This is the earth wire.

The green wire comes from the switch on the brake pedal that extends power from the 15A stop fuse to operate all of the brake lights.

There is a green/black wire from the flasher unit that extends the power from the 15A hazard fuse to operate the left front and rear hazard lights and a green/white wire from the flasher unit to operate the right front and rear hazard lights.

(click on image to enlarge)