It's not the voltage. And it is probably not the fuse.
I'll bet that the fuse holder is slightly corroded and the tangs have lost some
tension over the years. When this happens you get an "ohmic" contact that has
an amount of resistance. When current flows through the ohmic joint, heat is
created. The amount of heat is proportional to the amount of current and the
resistance (remember Ohm's Law). It is possible that the amount of heat could
have deformed the plastic.
The tangs of the fuse holder on each of of the fuse should be cleaned (e.g. with
a 600 grit emery paper) and the tangs bent towards each other to tighten the
contacts.
Vic Whitmore
76 Spitfire
Thornhill, Ontario
ualbert@juno.com wrote:
>
> Well my Spitty once again overheated just when I thought i had it fixed.
> The fan didn't turn on again. So I look at the fuse holder to see if it
> blew, and I couldn't even get it off! The fuse was "fused" onto the
> holder, and the plastic melted in such a way that the main contact melted
> over to the side, and hence, no connection. After fiddling with it for a
> while I rigged it back together and got home.
>
> A couple questions:
>
> 1. What is doing this? I'm assuming too high of a voltage
>
> 2. Is the fuse going to the fan unit 100% neccessary? I've had so many
> problems I'm wondering whether just to hard wire it and bypass the fuse.
> There seems to be another fuse holder in the line of wires for this
> thing.
>
> 3. What is the fuse rating for this?
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