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Quick And Easy Test Light Conversion

By on January 9, 2015
automobile testlights

 

 

 

 

 

 

 

 

For many years Automotive Technicians have used a test light with an incandescent globe for testing circuits and electrical fault finding such as to locate a defective fuse. You can check out the video below to see how to use a test light to find a bad fuse:

In recent decades, though, more up to date equipment must be used to protect delicate electronic circuits in modern vehicles.

A workmate of mine has always used the old style test light but realized the advantages of a LED test light and asked me if I could convert one of his old test lights.

auto test lights

autotestlight

After finding a base to locate the LED (I used a spare hose cap for this), I removed the globe and fed the wire through the side rather than the existing hole at the top. It is less inclined to get tangled this way.

I used a Bi-Colour Red/Green LED and a 330Ω resistor to suit. After about ½ hour the successful conversion was complete.

automobile test lightautomobile test light

auto test light

At only 20 cents AUD for components compared to $35 dollars AUD for a LED test light, I’d say that the conversion was well worth the effort and my workmate agreed.

Here is the schematic:

testlightYou can download the LED information from the link below:

http://pdf1.alldatasheet.com/datasheet-pdf/view/87056/KINGBRIGHT/L483GDT.html

This article was prepared for you by Mark Rabone from Australia.

 

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23 Comments

  1. biruk aweke

    January 9, 2015 at 10:14 am

    Very nice thanks for sharing.

    Likes(3)Dislikes(0)
    • joscamil

      January 9, 2015 at 7:23 pm

      Dear Mr. Yong , Mr. Rabone,

      I fully agree that this tester is a very nice, useful project. What is missing, but, is a small circuit diagram with connections.

      With kind regards,

      joscamil

      Likes(3)Dislikes(0)
  2. Robert

    January 9, 2015 at 10:35 am

    Thanks Mark. Nice job.

    Likes(0)Dislikes(0)
  3. Yogesh Panchal

    January 9, 2015 at 1:05 pm

    Mr.Mark Rabone,

    Good experiment!! keep up.

    Likes(0)Dislikes(0)
  4. Ernst

    January 9, 2015 at 5:12 pm

    Well done Mark. this is some thought to remember. I'm going to build one myself. I have these components lying around and never thought to make one myself.

    Likes(0)Dislikes(0)
  5. Abdul Haleem

    January 9, 2015 at 7:38 pm

    Hi Mark,
    Could you please send us the circuit diagram of this dual polarity tester? Is it the same like the one once Mr. Robert had published??
    Thanks

    Likes(4)Dislikes(0)
    • Robert

      January 10, 2015 at 10:52 pm

      Hi Abdul,
      The one that I made uses 2 cheaper LED's - a red & green soldered together because it's cheaper, although I have a bunch of Bi-color(RG) two lead LED's. I have all kinds of LED's including some expensive purple ones. I don't know how Mark get's them so cheap because they are $.50 a piece at www.allelectronics.com unless you buy 1000 or more, then they are $.35 a piece.
      Maybe Mark can give us the website that sells them so cheap?

      Likes(0)Dislikes(0)
      • Mark

        January 17, 2015 at 6:43 am

        Hey Robert,

        Here is a company that I commonly use because of price and availability. Hope it helps
        http://au.rs-online.com/web/p/visible-leds/2471167/
        As you can see the price is 14 cents each in a pack of 5.

        Likes(0)Dislikes(0)
        • Robert Calk

          January 18, 2015 at 10:45 pm

          Thanks Mark. I'm sure that will help many people. That is a cheap price on those LED's.

          Likes(0)Dislikes(0)
  6. Henrique Ulbrich

    January 9, 2015 at 8:18 pm

    Very good. Just a a practical experiment.

    One thing I could not understand: what is AUD?

    Likes(1)Dislikes(0)
    • Robert

      January 10, 2015 at 10:56 pm

      It stands for Australian currency.

      Likes(0)Dislikes(0)
  7. MAHESH

    January 9, 2015 at 10:23 pm

    great work Mark.
    Could you add what watt capacity LED used.

    Likes(0)Dislikes(0)
  8. Humberto

    January 10, 2015 at 12:33 am

    Good innovation, congratulations. Healthy and Happy New Year for everybody

    Likes(1)Dislikes(0)
  9. John

    January 11, 2015 at 8:24 am

    Thanks Mark. AUD is Australian dollar.

    Likes(0)Dislikes(0)
  10. Abdul Haleem

    January 11, 2015 at 9:43 am

    Hi Henrique Ulbrich,
    Let me answer your question for on behalf of Mark. AUD stands for Australian Dollar as Mark is an Australian.

    Ragards

    Likes(0)Dislikes(0)
  11. camber

    January 11, 2015 at 11:51 am

    I really enjoy your Web site!! I thought I had done something wrong
    when I could not find a schematic for the fuse test light. When I saw other comments asking the same thing I was relieved it was not just me.

    So where can I find the schematic?

    camber

    Likes(1)Dislikes(0)
    • admin

      January 11, 2015 at 5:20 pm

      HI Camber,

      Mark just gave me the schematic and i have uploaded it.

      Jestine

      Likes(0)Dislikes(0)
      • Robert

        January 11, 2015 at 6:39 pm

        In the USA green means go and red means stop. Does red mean go in Australia?

        Likes(0)Dislikes(0)
        • Mark

          January 12, 2015 at 10:00 am

          Hey Robert,

          As shown on the schematic, Red shows a positive connection and Green shows a negative connection

          Likes(0)Dislikes(0)
  12. G

    January 13, 2015 at 12:13 pm

    Mark,It's a good job and useful for all of us.
    Thank you very much

    Likes(1)Dislikes(0)
  13. Taring

    February 12, 2015 at 3:41 pm

    Always on the lookout for the cheapest price. Thank you

    Likes(0)Dislikes(0)
  14. Chris

    May 24, 2015 at 11:34 pm

    Hi! Good job and innovative. But, did you know does this cheap tool is not only a test light for newer cars? 🙂
    You can read out whit this tiny LED test light the trouble codes from some older cars and do not have to pay for any diagnostic equipment.
    If you thin I can write some article, about how to test cars for stored errors in their memory module and get out the error number whit some tools like this...

    Likes(1)Dislikes(0)
    • Gary Gemmell

      January 5, 2016 at 5:47 pm

      NIce Chris i always look forward to your hacks - you are a true man after my own heart - a true hacker and cracker!
      Keep up the good works!

      Hoots from Scotland!!!

      Likes(0)Dislikes(0)

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