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Thread: need some major electrical help=calling all engineers

  1. #1
    Newbie ssa_whiskey's Avatar
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    Oct 2003
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    Texas
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    need some major electrical help=calling all engineers

    ok maybe not engineers, sry if i lied, but i do need someone with a fairly complete knowledge of wiring and all the components involved. ok here goes: i have 2 questions

    1) i am going to make a switch panel that will be fiberglassed into my dash above my pioneer head unit. i do not like the look of the premade lighted switches (that light up when on) so i will most likely use single throw pole switches. these will be used to power various things, such as lights etc. what i do want is to use LEDs to show when the switch is on for night driving. i know that LEDs need some kind of resistor *i think i know* b4 being hooked up to a direct 12v source, so what color combo of resistor do i need to solder in b4 connecting to LEDs? also i want these switches to have fuses because some will power high current devices, and the thing i need to know is a) do i put the fuse b4 the switch (btween batt and switch) or after the switch (btween switch and device) and b)how do i calculate the correct amperage of fuse to put into the fuse panel ill also be making? each device will draw diff amounts and i dont just want to stick in a 30amp fuse for one that only draws 2. u know the hazards
    sry this is gettin so long
    and c) would it be ok to run the switches (only 4 or so) in parallel, or do i need to have a direct connect for each one to the + terminal on batt?


    geez guys im sorry i got to rambling, but i havent been to this forum in a while, and i knew that there are some smart people here that are also very helpful so, i would graciously appreciate ur help and advice
    -thnx
    marshall
    Boost is addicting, like crack, only not as cheap. -Kipernicus from [M]

  2. #2
    Raw Wave
    Join Date
    Jun 2003
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    1,823
    LED resistor calculator :

    http://ourworld.compuserve.com/homep...Bowden/led.htm

    A 680 ohms resistor should do the job, thats blue,grey,brown,gold 1/4 watts carbon resistor. The colour gold is the +-5% tolerance. The colour coding will be different for metal oxide type...google it!!! Connect the resistor to the +12V and the anode of the LED, the LED cathode (flat side) goes to 0V.

    Always connect the fuse just after you tap into the main supply...In your case its between the battery and the switches.

    You can connect all the +V of the switches into a common wire then into the battery through a single fuse. Just make sure this wire can take all the current you wanna drain.

    If you need +V supplies with different fuses then of course you need to run separate wire before feeding them to the battery throught different fuse rating.

    Fuse rating...just check the total current drain of the devices.

    I hope thats clear enough

  3. #3
    Newbie ssa_whiskey's Avatar
    Join Date
    Oct 2003
    Location
    Texas
    Posts
    9

    thanks

    thanks man, how exactly would i measure the drain, just wire them straight up, and use an ampmeter to measure the draw and put in a concurrent fuse?
    thanks again
    Boost is addicting, like crack, only not as cheap. -Kipernicus from [M]

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