Inleiding
There are a lot of important components in your instrument cluster, and it's only a matter of time before you'll need to pull it out to fix something. It's not such a daunting task, once you know a few tricks. This guide should help with this task.
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Begin by disconnecting your battery, pulling off the negative (-) ground cable.
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Then remove the driver's side kick panel. See the kick panel removal guide for help with this task.
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Pull the cluster out until you feel the tension of the speedometer cable.
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Normally, there will be just barely enough room for you to get your hand behind the cluster. You will need to feel around the center of the cluster, behind and to the right of the center of the speedometer cable, for the connection for the speedometer cable.
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The cable screws on to the back of the cluster with a knurled knob. It is to be loosened by hand. No tools will be necessary to unscrew this. Unscrew the cable until it is free of the cluster.
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With the speedometer cable disconnected you will be able to pull the cluster out further for more working room.
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Starting on the right side, begin disconnecting the items that attach to it.
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First, you will pull out any light bulbs that plug in to the right hand side of the cluster. On a diesel W123 this will include the glow plug bulb and seatbelt bulb. Then unplug the spade connector for the power supply to the clock.
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With the cluster removed on this car, let's take a second to identify some of the connections:
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Speedometer cable
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Oil line fitting
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Small plugs for cluster accessories and lighting
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Large primary plug
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Not pictured are the wires and bulbs for the glow plug and seat belt light, and the spade plug for the clock. Keep track of which bulb went in which socket - the wires will be different colors. On this car the wire for the seat belt light was green and the glow plug bulb wire was blue.
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And a bit more detail about the components on the back of the cluster:
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Light bulb sockets (some are used, others are blanked out)
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Speedometer cable connection
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Rheostat (dimmer) control
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Oil line connection
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Clock spade connector (note +12v symbol, this is the constant 12v supply that can damage your cluster if battery is not disconnected)
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Large primary cluster pins
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Accessory plugs
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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14Gids Commentaar
Any chance you can tell us what color of wires goes on each of the 15 pins from the large primary plug (Cluster pins) or even show a picture of where it all goes? Some of my wires got mixed up and it's really hard to tell which wires goes to what pins...
FYI I have a 85' CD300 if that helps. ;-)
brandon -
Hi, here is a link to a picture of the pin out diagram for the 15 pin plug behind the cluster.
Hi all, I am looking for Mercedes Benz W123 speedometer part no. 1235423601 0085425606
Any idea where I can find a store or supplier providing genuine new parts, thanks
Does it matter what direction the accessory plug on the speedometer is plugged in? It seems to go on both ways and I'm not sure if I am installing it right!