NipponDenso alternator wiring & plug
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    Administrator blackpopracing's Avatar
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    NipponDenso alternator wiring & plug

    Help! where in the UK can I get one of these plugs for my alternator?



    Also I don't quite get the wiring.

    Painless wiring loom has big cable to go to alty output post from fuseboard - OK
    Painless wiring has exciter wire to fuseboard - OK
    I need to run another wire to warning light on dash - OK (it's an LED with a resistor - do I need to add anything else in this wire?)

    4th pin - switched (power?) from ign switch? do I need to add this one?

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    Administrator blackpopracing's Avatar
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    Cheers Chris - good find, bit pricey - almost half what I paid for the new alternator!!!!

    Do you know anything about the LED on the charging lamp bit?

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    Gym Junkie chrisvs's Avatar
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    As it's a diode you will need to connect the positive side to the ignition switch and the negative side to the L terminal on the alternator.

    The original alternator warning light is usually around 2/3W but the LED will be much lower than that and it may not go out even though the alternator is charging, the solution is to add a shunt resistor across the legs of the LED, the value depends on the spec of the LED.

    It should be noted that an LED may not dim the same as a bulb does and may just be either on or off, also the LED won't light up if the alternator is over voltage because the current can only flow one way unlike a bulb where it can flow in either direction.

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    Administrator blackpopracing's Avatar
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    How about if I put a std bulb hidden in the wiring as well as the led?

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    I'm Not Jed Clampett stueeee's Avatar
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    Quote Originally Posted by blackpopracing View Post
    How about if I put a std bulb hidden in the wiring as well as the led?
    You could wire a small bulb across the LED and hide it somewhere, but why not just put a 50Ω 5W resistor across the LED. this will mimic the 3W bulb that would usually be in the circuit -the LED will still light. It's important that a reasonable current flows in this circuit because it is responsible for "exciting" the field circuit when the alty spins up; just the LED on its isn't likely to provide enough current.
    Stuart.
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    Off the Xmas card list kapri's Avatar
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    On mine I found it wouldn't charge if you connect all 3 leads Mark. I only use the light and switched live lead ( plus of course the output to the battery). I just used the small female terminals that you can buy rather than the plug. Also found that the cheap alternators are cheap as those plugs don't always fit

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    Off the Xmas card list kapri's Avatar
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    Not to disagree Stu but mine is working mine with a 'standard' led warning light fitted , no resistor added by me but is probably built into the light.

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    Administrator blackpopracing's Avatar
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    But if dont use the exciter lead I wont see a good voltage at the battery? - as both battery & fuseboard are in the boot & about 15 foot of wire away.

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    Quote Originally Posted by stueeee View Post
    You could wire a small bulb across the LED and hide it somewhere, but why not just put a 50Ω 5W resistor across the LED. this will mimic the 3W bulb that would usually be in the circuit -the LED will still light. It's important that a reasonable current flows in this circuit because it is responsible for "exciting" the field circuit when the alty spins up; just the LED on its isn't likely to provide enough current.
    Stu,
    I have a resistor (not sure the value?) wired inline with the led + lead to make it work with 12v - is this enough or do I need an extra one across the led legs? If so do I keep the inline resistor?

    I'm guessing it "should" be wired as the bottom picture?
    Last edited by blackpopracing; 10-04-2014 at 20:11.

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