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Old 12-09-2011, 02:48 PM
Join Date: Sep 2005
Posts: 664
Testing the clock on a 116

The photo, which might take a moment to load, shows the back of a 116 instrument pod. Midway towards the bottom and to the right is a connection marked 12V and this is for the clock. What I need to know is where is the negative connection?

Now I know it really makes little difference with a DC system where you ground something out, but I was wondering if there is a (-) connection just for the clock before I start touching everything back there with the negative lead. (The two poles above this and to the right that are marked (+) and (-) are for the tach.)

Anyone able to answer this?

Bonus question: Is there anyway to test the fuel gauge with a voltmeter or a 12V power source?
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Testing the clock on a 116-p1000910.jpg  
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Old 12-10-2011, 07:15 PM
Tomguy's Avatar
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If the 116 is like the 108 then the (-) comes from the back of the cluster itself. The whole plate "VDO Made in Germany" is the (-) source.
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Old 12-10-2011, 11:09 PM
Join Date: Sep 2005
Posts: 664
I just tried that and it did not work. Perhaps there is just too much resistance built up over the last 33 years.

But I did get the clock to work! I found that the ground is the little nub just to the left of the 12V connection. I just brushed into it and heard the clock start running. I left it hooked up and the clock kept good time during the time I had it powered up.

The nub is not marked. It just sticks out there, but it is making contact with the metal plate you were talking about. I guess I had to just go right to the source.

Looks like I need to take it all apart and clean everything so all the connections are once again good.

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Old 12-12-2011, 04:28 PM
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clock repair

Here we go:

Instrument Cluster Repair
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Old 12-12-2011, 09:12 PM
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Location: Northern Va.
Posts: 3,386
I looked at that link on fixing the clock. The text says to replace the 100pF caps. They show 100mF caps, so choose carefully. The RS number may be correct for 100mF.


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