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No tail lights

Discussion in 'XJ Technical Chat' started by sushi_biker, Feb 17, 2009.

  1. sushi_biker

    sushi_biker Member

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    Yesterday, I observed that my tail lights were out, but the whamo-dyne computer failed to alert me to this fact. This is what I've discovered:

    1. The computer has a separate circuit that passes a low current through the bulbs. The alert only happens when the resistance reading goes "infinite", indicating a blown bulb because the broken filament makes an open circuit. The computer does not know or care if 12 volts is being applied to the bulbs.

    2. The 750 Seca has a separate, additional 5 amp inline fuse for the tail lights. The wire which feeds the tail lights shows 0 volts. Physically, where on the bike is this fuse? Is it up in the gauge head because I can't seem to find it.

    According to the Haynes wiring diagram, the fuse is shortly downstream of the keyswitch.

    Thanks.
     
    sushi_biker, Feb 17, 2009
    #1
  2. CaptNemo

    CaptNemo Member

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    It is behind the headlight, in a single in line fuse holder. If it's original it is a white tube in a blue wire (guessing from memory on the wire color)
     
    CaptNemo, Feb 17, 2009
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  3. sushi_biker

    sushi_biker Member

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    It is a blue wire. I don't recall seeing a fuse near the headlight. Thanks for the tip, I'll check again. :)
     
    sushi_biker, Feb 17, 2009
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  4. Robert

    Robert Active Member

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    It's in there Sushi, I chopped mine out and installed a blade fuse holder.
     
    Robert, Feb 17, 2009
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  5. CaptNemo

    CaptNemo Member

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    Like Robert I just changed mine to the blade type as well, actually I'm in the process of putting the entire wiring harness back in after upgrading the main fuse box and detailing all the connections too. It was much easier working with it on the bench instead of in the bike. Chacals wire extension kit worked perfectly too.
    If you find the 3 terminal plug to the main switch, the fuse will be within a couple of inches in the blue wire as you already know, the 2 terminal plug is for the battery sensor.
     
    CaptNemo, Feb 17, 2009
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  6. sushi_biker

    sushi_biker Member

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    Ok, so I found the holder and the fuse was blown. It had been in there for so long that the fuse had lightly corroded itself to the copper contacts. That extra resistance is probably why the fuse blew.

    I know a couple of you guru's have spliced in a blade holder. My main fuse block was replaced with blade fuses. For some reason I hesitate to chop into an otherwise perfect wiring harness. Should I cut it or not?
     
    sushi_biker, Feb 19, 2009
    #6
  7. stereomind

    stereomind Active Member

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    CHOP IT :mrgreen:

    one less thing to worry about.
     
    stereomind, Feb 19, 2009
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