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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-16-2006, 11:05 AM   #1 (permalink)
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Instrument cluster wire

When I pulled the cluster on my 1990 325ic I found a wire (rubber covered rectangular end and with a open hole next to a metal post in the rubber covered end). I assume it plugs into the back of the green plastic box on rear of cluster that has three openings on on side and two on the other for this style of connecctor. Anyone care to guess which port this wire connects to, or is it even required. Thre car starts and runs and all features (save the left turn signal indicator on cluster ) work. I pulled the cluster to reflow the turn signal indicator wiring (to noavail0. I also have a blue wire with slip on end hanging below dash and I have no idea where, if anywhere that one goes.
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Old 03-19-2006, 10:06 PM   #2 (permalink)
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If you are looking at the bottom of the plug with the speedometer face down, it goes into the upper right plug.
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Old 03-20-2006, 10:55 AM   #3 (permalink)
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Mystery plug

Great, but what does it do? There are three ports on right side of speedometer and I have tried the lower and middle so far and I see no change in anything.
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Old 03-20-2006, 07:03 PM   #4 (permalink)
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It's the speedo feed for your cruise control, with out it your cruise won't work.
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Old 03-20-2006, 08:43 PM   #5 (permalink)
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Strange Wire

Interesting, I have tried hooking it up to both the lower and the middle ports and the crusie still works.
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Old 03-20-2006, 10:42 PM   #6 (permalink)
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Originally Posted by Bear
Interesting, I have tried hooking it up to both the lower and the middle ports and the crusie still works.
It will, all three share the same output, the last is the factory "correct" plug in, not that it makes a difference. Just as long as it's connected.
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