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anyone have info on the pulse generator on an 81 xj 750 seca

Discussion in 'XJ Technical Chat' started by jace5150, May 8, 2011.

  1. jace5150

    jace5150 New Member

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    jace5150, May 8, 2011
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  2. SQLGuy

    SQLGuy Well-Known Member

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    What "pulse generator" are you talking about? The ignition pickups? The TCI? The unit in the speedometer that sends distance information to the turn signal canceller? Something else?
     
    SQLGuy, May 8, 2011
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  3. maverickbr77

    maverickbr77 Member

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    I would guess he means the pickups I know on mu brothers honda book they call their counterpart pulse generators.

    what kind of info are you looking for on them jace
     
    maverickbr77, May 8, 2011
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  4. jace5150

    jace5150 New Member

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    Re: anyone have info on the pulse generator on an 81 xj 750

    ok maybe its not called a pulse generator (sorry) its the round barrel looking thing und er carbs
     
    jace5150, May 9, 2011
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    "the round barrel thing under the carbs" is either the generator or the starter, depending on how you define "under."
     
    bigfitz52, May 9, 2011
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  6. pirok

    pirok Member

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    Re: anyone have info on the pulse generator on an 81 xj 750

    So what about it?
     
    pirok, May 9, 2011
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  7. SQLGuy

    SQLGuy Well-Known Member

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    OK. Sounds like you're talking about the alternator.

    Shotgunning, here's what I know about it:

    It was made by Hitachi
    It's rated 19A
    It doesn't reach full output until about 3500 RPM
    Rectifier and regulator are external - mounted under the left side cover
    It's not uncommon that people have problems with them due to worn brushes. Brushes are easy and inexpensive to replace.
    Another not uncommon problem is that the contacts in the plug between the alternator and the rectifier/regulator overheat and need to be cleaned and maybe reseated.
    Replacement stators are available for about $120.
    One of the three lines from the alternator is jumpered to the diode block to trigger the headlight relay when the engine is started.
     
    SQLGuy, May 9, 2011
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