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-   -   Melted 25amp fuse.... (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/168678-melted-25amp-fuse.html)

nige944 06-21-2004 08:22 AM

Melted 25amp fuse....
 
So i replaced my blower/rear hatch fuse the other day, the previous fuse having been sacrificed to slot #6 and the Evil fuse eating AC gods.

A few hours later I was driving along basking in the moist antifreeze laden air coming from the few vents that work and my blower started working intermittently and then quit.

I checked the fuse and found that while the metal part was still intact and almost in place, the plastic section was nowhere to be seen. It was later found under the mat with both ends melted off.... The second fuse did the same....

Must be a new fuse design whereby the plastic melts before the metal does....

Has this happened to anyone else? I took the fuses back and got a refund. I'm buying a fire extinguisher today... Just in case...

N.

Lawrence Coppari 06-21-2004 08:38 AM

Are you using a fuze with the correct amperage rating?

nige944 06-21-2004 08:42 AM

Its a 25 amp fuse in a 25 amp slot.... either way I would expect the metal part of the fuse to go first :-)

Lawrence Coppari 06-21-2004 08:50 AM

So would I. However, I have an old MB that has bare fuzes. They get rather warm. They are designed that way. But that is a different car.

Any idea how much current is being drawn?

nige944 06-21-2004 08:55 AM

Not really, my ammeter only goes up to 10, and i dont really want to blow its fuse. The store had some glass fuses with the pointy ends that they gave me to try, they are very similar in length and say "for german cars" on the packet so i'm going to give one a try later.

SoCal Driver 06-21-2004 09:53 AM

Plastic bodied open buss fuses? All the ones I have are ceramic cores.

nige944 06-21-2004 10:00 AM

mine are all open bodies plastic ones with the pointy ends.

IceShark 06-21-2004 10:36 AM

Your contact between the fuse connectors and the fuse holder connectors have too much resistance due to corrosion, loose fit, etc. What is happening is you have turned the fuse into a mini toaster oven that gets hot enough to melt the plastic before it gets even hotter and melts the metal. Just think of it like your cigar lighter.

Hard to believe the first time you run into this but that is what is happening. I saw an inline fuse melt the plastic and burn the rubber holder up before it finally got hot enough to blow the metal fuse filament.

nige944 06-21-2004 10:41 AM

Quote:

Originally posted by IceShark
Your contact between the fuse connectors and the fuse holder connectors have too much resistance due to corrosion, loose fit, etc. What is happening is you have turned the fuse into a mini toaster oven that gets hot enough to melt the plastic before it gets even hotter and melts the metal. Just think of it like your cigar lighter.

Hard to believe the first time you run into this but that is what is happening. I saw an inline fuse melt the plastic and burn the rubber holder up before it finally got hot enough to blow the metal fuse filament.


It sounds more than plausible after looking at the state of the connectors, thanks.

Lawrence Coppari 06-21-2004 02:16 PM

What you show is just like what is in my old Mercedes. The difference is that mine are ceramic. They do not melt, but they do get rather warm. Didn't know anyone else used the things. Plastic would not work in mine.


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