Question about 1985 BMW 5 Series

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Tach, speedo and temp gauges all not working - 1985 BMW 5 Series

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  • jclarkb May 03, 2010

    I did the obvious. now is there a relay that pertains to dash controls

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  • Master
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Check the fuse box out under the hood on the drivers side for corroded fuses, they usually do not even blow out they just corrode and stop functioning, although you still might find a blown fuse or two. That fuse box is the weakness that those years BMW's had.

Remove the fuses and clean the ends of the fuses and the fuse connectors inside of the fuse box with a light sandpaper, or even a fingernail file works alright. Especially make sure that the instrument panel fuse connectors and gauge fuses are clean and shiny again and not blown out.

Posted on May 02, 2010

  • Zaraki May 03, 2010

    Yes, there is a master relay, and you should also clean the contacts to the relays, both on the relay itself, and the connections down inside the fuse box. There is also a large (usually with a metal housing) dual solenoid that is mounted to the firewall, make certain that all of the connections to this relay are also good and clean. Use a small ignition file, light sandpaper, or an emery board type fingernail file to clean and shine up the connections.

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