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Thread: Driving lights wiring harness needs an accessory fuse

  1. #1
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    Driving lights wiring harness needs an accessory fuse

    Hi there,

    I purchased a set of Hard Korr 7” driving lights for my D3 and am partway through the install. I’m not an auto electrician but it’s all plug and play apparently. See attached. These lights require a piggyback to run off an accessory fuse. I’d like to use a fuse in the engine bay if possible.

    The piggybacks for the fuses which come with the wiring harness are regular and mini in size. I’ve also attached a pic of my fuse box. Any idea which one I can use as the “accessory fuse”?

    B0C026C2-D6EF-4607-849D-3546B32EA399.jpg55AC4F77-989C-4186-9B77-E304E234529B.jpg

    Any help much appreciated.

    zzz

  2. #2
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    From memory one of the ones near the 2 Red fuses is an accessory switched source.

    Grab a multimeter Driving lights wiring harness needs an accessory fuse

  3. #3
    BradC is offline Super Moderator
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    I've been through the wiring diagram and I can't find an accessory driven circuit in the engine bay.

    There are a few ignition driven circuits however. My go to would be fuse 7 or 8 (heated seat circuits) if you had to use an "add-a-fuse".

    I've tapped an ignition feed from the relay socket with the circle around it. Just stick a standard 6.35mm spade in there.

    Untitled.jpg

    Plenty of accessory fuses in the central junction box, but stuffed if I can find any in the engine bay box.

    Edit: 7 is climate control, 8 is heated rear seats. Both come off the same relay that supplies the lighting circuits also and is directly switched by the ignition signal.

  4. #4
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    Tap engine on for DRLs or they will be on when ignition is in accessories.

    You don’t need them when it’s off

  5. #5
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    Quote Originally Posted by BradC View Post
    I've been through the wiring diagram and I can't find an accessory driven circuit in the engine bay.

    There are a few ignition driven circuits however. My go to would be fuse 7 or 8 (heated seat circuits) if you had to use an "add-a-fuse".

    I've tapped an ignition feed from the relay socket with the circle around it. Just stick a standard 6.35mm spade in there.

    Untitled.jpg

    Plenty of accessory fuses in the central junction box, but stuffed if I can find any in the engine bay box.

    Edit: 7 is climate control, 8 is heated rear seats. Both come off the same relay that supplies the lighting circuits also and is directly switched by the ignition signal.
    used the piggyback off fuse 7 - worked a treat. Thank you very much

  6. #6
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    Please pardon my ignorance, but why you need an accessories or ignition connection to operate driving lights?

  7. #7
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    Quote Originally Posted by drivesafe View Post
    Please pardon my ignorance, but why you need an accessories or ignition connection to operate driving lights?
    To use the DRL functionality
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

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