3 wire alternator wiring - Page 2
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  1. #11
    Official RnS Addict Stroprock's Avatar
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    If I use two wires from alternator to battery instead of one thick one, is 27 amp rated wire sufficient?

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    I'm Not Jed Clampett stueeee's Avatar
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    Yes,
    Lucas 18 ACR alternators don't get near 54 amp output.
    Stuart.
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    An 18 acr is 45 amp but a 25 - 30 amp cable is perfect for the job. The rating of 27 amp is continuous flow but is capable of running up to about 70 amp for short periods...

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  6. #14
    Official RnS Addict Stroprock's Avatar
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    I have a push button starter for the starter motor/solenoid and a seperate toggle switch which goes from the coil to the solenoid. Which is my 'ignition switch' which I wire the light in series to? The starter button or the coil toggle switch?

  7. #15
    Rods 'n' Sods Junkie robwizard's Avatar
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    Bring this back to the top because I too am struggling with a similar issue..

    I am trying to put an alternator in my Amazon and struggling.. I have got past the space issue and made some brackets to give it a bash but now I need to wire it and I am an idiot when it comes to this sort of thing.

    My alternator is a Lucas unit, the part number is LRA346 and it has the following terminals on it that I can see..

    W, which sticks out like a pin/socket
    B+ which is another sticky out one
    AUX which is a single blade
    IND++ which is another single blade..

    Any suggestions?

    Cheers

  8. #16
    Burn out champ 2010 Dusty's Avatar
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    Pretty sure that "ind" is the warning light, "B" is thick cable to starter solenoid or battery, "W" will be the live feed into the fuse box. I think you can ignore "aux"
    Crew Chief of 'Miss-Guided' drag team; Super Pro ET 7245

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    Official RnS Addict brading's Avatar
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    Googled this and all I can find is that W is for a sensed rev counter. So I would wire it I to warning light and B to solenoid then check if it is charging ok.

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    Rods 'n' Sods Junkie robwizard's Avatar
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    Hmmm OK that's sounding a bit more understandable.. Cheers guys!

  11. #19
    Rods 'n' Sods Junkie robwizard's Avatar
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    Furthering this discussion I have learned now the following, this relates to the Volvo Amazon I am trying to do this on..


    "There should only be 2 wires coming out of your harness once you remove the old voltage regulator. One is small and red, and goes to the dash light. This performs the exciter function for the field coil. The other is a heavy black wire that runs to the starter, it should be connected to the alternator output."

    So apparently according to some other stuff I have read the alternator grounds through the bracket it is attached to? So For mine am I correct in assuming that..

    B+ on my alternator should be attached to the thick black wire
    It's going to ground through the bracket
    My red wire, which is the dash light and also the "exciter".. this I am confused with? Where does this go?

    Please excuse my ignorance.. Welding CHECK Machining CHECK Electrics.. no check...

    Cheers

  12. #20
    I'm Not Jed Clampett stueeee's Avatar
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    Quote Originally Posted by robwizard View Post

    B+ on my alternator should be attached to the thick black wire
    It's going to ground through the bracket
    My red wire, which is the dash light and also the "exciter".. this I am confused with? Where does this go?
    If the red wire dooes go to the ignition warning light then that's the one to connect to the excite/field terminal on your alternator. When you turn on your ignition there is a +12V behind the ignition warning light bulb, it lights up to the negative earth via the alternator's internal field. Once the alternator starts to charge (using the field excite voltage you've just provided) the alternator's field produces its own +12V and your ignition warning light goes out beacause there's +12V on both sides of it.

    The B+ terminal should be connected to the battery, if you're using the original wire, check that it's thick enough as most alternators push out a lot more current than 50s/60s dynamos.

    HTH.
    Stuart.
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