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Message: <blockquote data-quote="ehoe" data-source="post: 49503" data-attributes="member: 141">Well the best way to check if its a blown fuse is to check if there is any current flowing to the demister wires on the rear windscreen. You can do this using a volt meter or even just a simple bulp tester by checking the current flow on the wires going to the demister at the rear. On the E34, you can remove the rear side panels (where the interior back lights are) and you will see all the wires. I had a friend whom also had a failed rear demister too and he checked all the fuses and wiring and everything was working fine. So conclusion was the actual demister wires on the windscreen itself must have a break it in so the current is not flowing thru them to heat up. Well thats bad news coz the only way to fix that is to replace the entire rear windscreen!. OUCH!.  :blink:</blockquote>