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  #1  
Old 09-28-2006, 02:56 PM
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Join Date: Feb 2006
Posts: 34
300E blowing dashlight fuse and rt tail light

This is FYI to help other 300E owners. blowing fuses for dash lights and rt tail light????

My car is a 300E.
This fuse 3 under the hood seemed like it would blow whenever it wanted. One day I was lucky enough to chase it to blowing every time I went over a speed bump. A little more looking, I found that if I slammed the trunk shut hard, it will blow. This would not happen everytime, but I finally got lucky and it was enough to help find the problem.
I've seen post on this in the past but it wasn't the same fix. I spent much time finding this one. After chasing down everything it turned out to be the wires going to the trunk for lighting. At first glance I ignored this because the plasic wrap seemed fine. After I opened up the plastic wrap going to the lights in the trunk, I found the broken wires causing fuse #3 to blow. These wires break over time even thought the hard plastic wrap looks perfect. Maybe this will help someone pulling out their hair!

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Old 09-28-2006, 04:09 PM
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Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,072
Broken wires will make a circuit go "open" which means no current flow. Open circuits will not cause a fuse to blow. I suspect that there was a short involved somewhere. The most likely cause is a spot where the insulation was worn and allowed it to touch the car body. That is a short circuit and will cause a fuse to blow without question.
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Old 01-07-2007, 05:22 PM
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you are jumping to conclusion. I posted this to help people. There is a negative and a positive in the wrap. the wires were broken and rubbing each other.

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