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Darren firth Posted on Jan 19, 2019
Answered by a Fixya Expert

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I have dim headlight & beam on my Aprilia SR50.

I've checked the connector on the regulator, which seems fine. I've disconnected the front lights & tried to test the voltage coming through, but can't seem to find anything. Any ideas would be appreciated. Thanks Darren

1 Answer

Peter Hall

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  • Expert 67 Answers
  • Posted on Jan 20, 2019
Peter Hall
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Most likely cause is a broken or bad earth on the dim light (power then has to go through 3 filaments in series to get to the earth on the good light).

  • 1 more comment 
  • Darren firth
    Darren firth Jan 20, 2019

    Thanks for that.
    Where will I find the common earth?

  • Peter Hall
    Peter Hall Jan 22, 2019

    It is one of the 3 wires connected to the headlights. Measure voltages on each of the 3 wires at both high and low beam. The wire that never goes to +12v should be the earth (0 volts, connected to negative side of battery). Looks like it's black on the wiring diagram.
    Sometimes the earth connection fails at the bulb, check for good clean connection at bulb and try swapping the bulbs over. Very likely to be something near there.

  • Darren firth
    Darren firth Feb 16, 2019

    All sorted now. Thanks

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5 Related Answers

A

Anonymous

  • Posted on Jul 16, 2008

SOURCE: low beam headlights do not work, but high beam headlights do

Clyde,

I've been troubleshooting this same problem on a different vehicle this week, and I can give you the steps I'd take.

1. If both sides went out at the same time, the problem is *NOT* likely to be the bulbs.

2. Check the fuses to see if both low beam lights are on the same fuse. Many cars have one fuse for low beam and another for high beam, so both lights out at the same time typically means fuse blown.

3. If the headlights are OK and the fuses are OK, then the problem is *LIKELY* the headlight switch. In my case, AutoZone has one and it can be installed easily; but in your case, that may not be as simple.

Please post your findings or comments.

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Anonymous

  • 1 Answer
  • Posted on Jan 03, 2009

SOURCE: headlights and interior lights flicker

we had the same problem there is a small line that connects itno the alternator, it kept jiggling loose. we found a way to tighten it and the problem went away

Anonymous

  • 1066 Answers
  • Posted on Apr 01, 2009

SOURCE: Honda CRV 2007 dim headlights

add some driving lights or re aim your high beams lower so you can use them all the time.

Anonymous

  • 1 Answer
  • Posted on Jul 15, 2009

SOURCE: Jeep Headlights not working. High beam works

had the same problem on my 92....check under the hood on the drivers side,towards the front,there is a "junction box" with all of the lighting wires connecting from the switches to the lights.My wires were all corroded inside,so I cleaned the ends and bought a new box from the local electronic supply store.The problem has not come back.

Cheers

Anonymous

  • 832 Answers
  • Posted on Nov 08, 2009

SOURCE: Hi. The driver side headlight is dim while the

The driver side headlight is dim. This is caused by loose
ground contact of the headlight ground terminal. Have
a check on this by tightening it up or reconnecting to
good ground (chassis).

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