Blown fuse, hazards

ALAIN GAUDREAULT

MEMBER
2012 MAZDA 5
130,000 MILES

Hi,

Hazard/flasher fuse keep blowing on hazard "on", and right flasher "on" also. Pull 15 amps and more, fuse is a 10
Lamps are not lighting up at all, but they were both front and rear, and kept working for a day before blowing, and while troubleshooting they stopped working all the way.
Trailer harness look okay, After market sound system disconnected.
No blinker sound, with or without bulb in.

Left turn is okay.

I saw that there are no hazard relay on the car.

Turn switch and hazard switch do the same symptoms.

1 Reply

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

The fuse keeps blowing because your vehicle has a short to ground somewhere in the circuit the fuse is protecting. This happens because of the laws governing electricity known as Ohm's Law. Ohms law states that if one of the three properties of electricity is constant (in automotive electricity one always is constant 12 volts DC) (Battery Voltage)) then If one property goes down(Resistance-Short to ground=Zero resistance) the last property must go up at the same rate (amperage-short to ground=amperage to Infinity). The currant, or amperage, will always exceed the fuse rating of the circuit, and "pop", the fuse blows, protecting the circuit, just like it was designed to. In the diagrams down below I have included a wiring diagram for the Hazard Flashers Circuit. Please check for a short to ground in the wires that are highlighted in the wiring diagram and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

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Blown fuse, hazards

1 Reply

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