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Old 01-20-2007, 09:40 PM
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Join Date: Jan 2007
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w123 instrument schematic - 300d

I have a 1978 300d. I'm trying to troubleshoot the instrument cluster. As of right now, I have no instrument lights. I installed a new pot, no joy.

Using a test light, I found that the green/white wire on the headlight switch is always hot, ignition on or off and headlight switch on or off. This same wire, I think, feeds the green/white wire to the instrument lights. Now I'm not too bright, but I think that this is not good.

With the instrument cluster plugged in (with the 14 prong plug) I have no instrument lights.

If I jump off of the green/white on the headlight switch to the prong on the instrument cluster that the green/white wire feeds (marked #13 I think), I have instrument lights.


Does anyone have an electrical schematic they can post or send to me?

TIA

Sandra
Near Sacramento

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Old 01-21-2007, 12:09 PM
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Join Date: Feb 2006
Posts: 131
hey still need the wiring diag....if so i can get it to you via the fsm

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