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Thread: Big Red Speedo Light question

  1. #1
    Join Date
    Nov 2013
    Location
    NV/MI
    --
    66

    Big Red Speedo Light question

    Bought a new bike that had a speedo on it. The light only works when i touch the edge of the case when putting it inside the head unit. Once it pops into place with the rubber grommet the light goes out. Seems like a ground issue but I went through and checked all the wires in the harness. Is there something inside the head unit that will ground the light? Any help would be great! Thanks

    Matt
    Last edited by MFW; 11-12-2019 at 03:05 PM.
    Honda Trikes
    1983 Honda ATC 70
    1985 Honda ATC 70 x2
    1984 Honda 125M
    1985 Honda 250es

    Honda (non trikes)
    1968 Honda z50
    1969 Honda z50
    1970 Honda CT 70H
    1972 Honda CT 70H
    1973 Honda CT 70
    1993 Honda 300 4x4

  2. #2
    Join Date
    Nov 2013
    Location
    NV/MI
    --
    66
    Any Hondaline Speedometer experts out there?
    Last edited by MFW; 11-12-2019 at 03:23 PM.
    Honda Trikes
    1983 Honda ATC 70
    1985 Honda ATC 70 x2
    1984 Honda 125M
    1985 Honda 250es

    Honda (non trikes)
    1968 Honda z50
    1969 Honda z50
    1970 Honda CT 70H
    1972 Honda CT 70H
    1973 Honda CT 70
    1993 Honda 300 4x4

  3. #3
    Join Date
    Apr 2011
    Location
    Mexico
    --
    7,866
    Quote Originally Posted by MFW View Post
    Any Speedo experts out there?
    David Hasselhoff comes to mind.

  4. #4
    Join Date
    Nov 2013
    Location
    NV/MI
    --
    66
    Haha, good one!
    Honda Trikes
    1983 Honda ATC 70
    1985 Honda ATC 70 x2
    1984 Honda 125M
    1985 Honda 250es

    Honda (non trikes)
    1968 Honda z50
    1969 Honda z50
    1970 Honda CT 70H
    1972 Honda CT 70H
    1973 Honda CT 70
    1993 Honda 300 4x4

  5. #5
    Join Date
    Apr 2012
    Location
    MI, USA
    --
    3,449
    Far from an expert on these, but I've made reproductions from NOS sockets for these. The light housing shouldn't effect the light in any way, the wires goes directly to the socket/bulb. There should be a green wire + brown wire. Green is the ground, brown is the +12v and should only give power to the bulb when the light switch is turned on. Maybe the socket is corroded, or the bulb is failing?

    Here's some photos to reference on my reproduction socket, it should look very similar to what you have.

    https://www.ebay.com/itm/192928084416

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