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  1. #1
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Trailer light test box

    I am going to build a set up so I can trouble shoot my trailer light without having to hook it up to a vehicle. The only problem I have is what can be incorperated to protect the power source from a dead short?


  2. #2
    Moderator RX951's Avatar
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    is it a trailer tester like this ?



    * for your setup your building, I would add an inline fuse to the main power supply to protect it form shorts

  3. #3
    The ski's have taken a "backseat" to the Corvette DarthAWM's Avatar
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    Quote Originally Posted by RX951 View Post
    is it a trailer tester like this ?



    * for your setup your building, I would add an inline fuse to the main power supply to protect it form shorts
    No I am going more for a 12v supply to the trailer a fuse would probably be good

  4. #4
    Moderator RX951's Avatar
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    yup, an inline fuse will be sufficient




  5. #5
    ah yup, that will work just dandy!... or you could put a circuit breaker inline and just re-set it instead of changing fuses...just a thought...

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    Moderator RX951's Avatar
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    Quote Originally Posted by Pale Rider View Post
    ah yup, that will work just dandy!... or you could put a circuit breaker inline and just re-set it instead of changing fuses...just a thought...
    +1 great idea Andy

  7. #7
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Take a look at the bottom of this page ,,4 bucks
    20-30 amp auto-rest http://www.marksrv.com/wiringsupplies.htm
    just a thought
    mattman
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  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by DarthAWM View Post
    I am going to build a set up so I can trouble shoot my trailer light without having to hook it up to a vehicle. The only problem I have is what can be incorporated to protect the power source from a dead short?
    Use a high current 12 volt light bulb (headlamp or similar), in series with the 12 volt power source.

    If you have a short, it just lights up brightly.

    If things are normal, the high current bulb just glows dimly, and the regular trailer lights work normally.

    Choose a bulb that draws less AMPs than the fuse rating or the power supply current capacity, but not so few amps that it becomes a major voltage drop during normal non-short trailer light testing.

    Edit; You could take 4-6 regular auto tail light bulbs (with pig-tail sockets), wire them together in parallel, then connect that set of bulbs in series with the power source, instead of using one high current bulb. Same short circuit protection, just using smaller bulbs.

    If it would be helpful, I could upload a schematic diagram.
    Last edited by K447; 04-28-2008 at 09:28 AM.

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