I have a 83 300sd that everything on it it worked until yesterday.I switched from heat to A/c and nothing.Nothing to do withthe heat or a/c is working now.Both 11 and 10 fuses are fine but nothing works no fan,no a/c clutch the only thing that seems to work is the water valve.When you push the buttons on the controller you can hear the valve opening and closing.About 6 months ago it did blow the 10 fuse but since I replaced it has worked fine until now.Does it have any kind of relay for this?

Have you checked the strip fuse? They develop hairline cracks in them at times. Best to inspect and cleans the screw contacts as well. If another is needed, give the strip a slight bend in the middle and install it that way.

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I have checked the strip fuse and it is working fine.I got another controller today going to see what it does.