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Old 04-29-2013, 02:18 PM
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Graham Graham is offline
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 4,490
Quote:
Originally Posted by my123ca View Post
There is a blue wire from the instrument cluster that runs thru the floorpan and ends in rear door switches. It provides illumination to the switches. Remove the cover on the drivers knee rest(?), you will find where it is connected. If you disconnect the blue wire there and the fuse does not blow, you found your problem.
So far as I could see, the cables from the cluster plug are wrapped and then enter a larger harness that runs under dash toward center console. But it does not appear there. There are several blue wires, one of which connects to the CC illumination and the light tube spider. The other two disappear again and presumably go to the hazard switch and the window switch lighting.

I checked the resistance between pins 12 and 15 on the cluster plug. That should measure resistance of all connected bulbs in center console, window switches etc. Meter registers 0.0000 but then gradually settles on about 4.7ohms. The cluster illumination measures 3ohms across pins 12 and 15 - it has 9 bulbs so about in proportion. Total 7.7 ohms. That should draw about 1.6 amps.

So maybe short is somewhere else?? But with cluster out, running lights, shift light and warning system work and fuse does not blow.

I need to look at those other blue wires. I seem to recall that one used to go to the old radio illumination. But new radio does not need that. So where does wire go now? Need to do some more detective work!
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Graham
85 300D,72 350SL, 98 E320, Outback 2.5
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