I've just written the following just for the sake of a troubleshooting routine:
disconnect the headlight bulb from the headlight socket.
Replace the bulb. They're cheap and is the easiest step to do before following the next.
http://www.supercheapauto.com.au/Produc ... 55W/378078
Once replaced, if the headlights still don't function as they should then follow:
Use any multimeter and set it to volts 0-40 volts range.. (or any voltage range to read 12v). These can be picked up for under $10 from jaycar
https://www.jaycar.com.au/low-cost-digi ... m/p/QM1500
Holding the h4 loom plug in your hand, and arranged so the 3 terminal plug socket is facing you WITH the centre pin hole at the top:
The left vertical pin hole is for highbeam.
The top horizontal pin hole is for low beam,
The Right vertical pin hole is for earth.
Screen Shot 2016-12-09 at 10.52.07 AM.jpg
- Put your ignition on, and turn the headlight on to low beam.
- Put the earth lead of the multimeter to chassis ground, make sure it's a good solid connection. Aligator clips to any exposed metal bolt head on the engine or chassis will be fine. If you dont have aligator clips, hold the probe against any unpainted metal on the chassis or engine.
- Stick the red multimeter probe all the way into the H4 socket's holes, making sure the probe makes contact with the metal pin connection.
If you stick the probe into the top horizontal pin hole, then the multimeter display should show a voltage with a reading somwhere between 11-14 volts. It shouldnt read anything for the left or right vertical pins.
- Now click the headlights to the highbeam position.
- Re probe the headlight socket pins again. Now the multimeter display should show a voltage with a reading somwhere between 11-14 volts on the left vertical pin and nothing for the others.
If you are not reading any voltages for the steps outlined then you have a fault with either the h4 bulb connectors, headlight fuses or the headlight stalk switch combo assembly.
If the H4 bulb connectors look fine, looking for
obvious signs of melting, excessive corrosion or loose connections - It's very unlikely to have any of these.
Visually inspect the fuses.
If all checks out here, you'll need a new stalk.