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Focus Mk1 Reverse Light Problem


siber_pir8
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Hey Guys, I have a problem, reverse light isn't working. When i put it in reverse I get 11.5 volts at the bulb connector but the light still doesn't come on. I have obviously checked the fuse and bulb. I know the reverse switches are common but if im getting voltage when in reverse then it should be working. I have also put a wire to earth and connected it to a separate earth and still nothing. Any other ideas?

Cheers.

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check for corrosion on the pins inside the bul;b holder usually if that doesnt sort it get a replacement holder

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Yep checked them too and check voltage is getting to the metal contacs inside when I put the bulb in the volts drop to 0.4 as if it is working but it doesnt.

I just cant understand why it doesnt work.

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The volts shouldn't drop. This shows you have a high resistance somewhere in the circuit. Since you say you've tried wiring an alternative earth I would suspect a faulty switch or corroded connection in the live feed. If you can get access try checking the voltage across the switch (with the ignition on, obviously). This should go to zero when reverse is selected. If you can't make contact with the pins another test would be to unplug the connector and bridge the contacts with a piece of wire. If the light then works this will show the switch is faulty. If not measure the voltage between the bridge wire and earth. If this is not battery voltage then the fault lies earlier in the circuit and you need to check back progressively to the fuse board. If the voltage is present at the bridged connector but the lamp doesn't light the fault must lie between the connector and the lamp.

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