melting fuse

[colin mee]

Help.keep melting a fusein the glove box it never blows just melts.took it out and everything works.any ideas

[mrzigazaga]

Hi mate...Whats it for...Normally when that happens its overrated for the application...Which is either done accidentally or intentional to stop blowing fuses...Its not only stupid but potentially dangerous!...Ziga

[colin mee]

Its the 3rd one down and 3 across.took it out and everything still works

[mrzigazaga]

Headlight...Dipped beam = 20amp?....

[SLB]

I used to have the same problem with the fuse for the cooling fan in hot weather. In the end I removed the block of fuse holders and found the wiring/crimping on the back had corroded and was in poor condition resulting in it getting too hot. I had to fit an auxiliary fuse holder for it which was a higher rating and never had the problem again.

[colin mee]

That must be why my full beam stop the other night thought it was the rain.will check what the fuse ratings that was in.thanks for the help

Edited by colin mee on Wednesday 1st October 21:18

[GV]

A fuse melting usualy means there's been a short in the circuit with the fuse being incorrectly rated for what's being used...

[mrzigazaga]

GV said:

A fuse melting usualy means there's been a short in the circuit with the fuse being incorrectly rated for what's being used...

EXACTLY.....Which can lead to loom fires and if that happens then say goodbye to your P&J.....Ziga

[maston]

I had a fuse that was melted, it was the fuel pump of all things !!!!

I had to re wire it away from the fuse box via an in line fuse.

Sorted the problem.

I think it was a corroded terminal or something ???

[colin mee]

I took the fuse out and all works. Time for thr tester out I think

[adam quantrill]

Is it the fuse for the optional toastie machine? ;^)

[phillpot]

Out of curiosity what size fuse is it?

I think some cheap aftermarket fuses have thinner "blades" on then = loose fit = resistance = heat

or the bits in the fuse board it clips into could have "opened up" a little and or be corroded, again creating resistance?


If it's getting hot there must be current flowing to something

[colin mee]

It is a yellow 20 .and I had only just fixed the fuse box in.lol

[SLB]

GV said:

A fuse melting usualy means there's been a short in the circuit with the fuse being incorrectly rated for what's being used...

Usually yes, but in my case the poor crimps and corrosion meant it got warm and after continual use the whole thing got hot and melted the plastic around the fuse. When I replaced it with a separate fuse holder the fan ran very very slightly faster so the old wiring wasn't capable if supplying enough current.