Fuse

[arcturus]

Why would this happen? from my Kenlowe fan. Is it normal?

[old fart]

Too small a fuse for the current?

[arcturus]

Original from factory.

[mocambique-amazone]

A: from China
B: fuse nor good enough setted inside fuse holder

good luck, Kay

[Faust]

Had a similar issue in the kenlowe fan I had fitted to a 2.9 XR4x4 Sierra years back.

Dodgy earth at the fan was the problem - if it's similar to mine, you'll find the main power lead for the fan and an earth lead emerge together. Make damn sure this earth is good, clean and secure.

Fix your earths (check the one at the relay), nice new fuse (and holder if it's damaged) and you should be good to go.

[Ron Kwas]

arcturus;

Plastic has melted from heat (no news there!)...but why?...looks like heat was caused by arcing (see carbonized left terminal) and arcing should not occur if male terminal of fuse is properly mated and in good contact with female terminal of fuse-holder (which it clearly was not), so I don't think fuse has the problem, but fuseholder does, and I agree with Kay's assessment B!...I'd inspect the offending terminal of fuse-holder (if possible, check from the backside to see if it is out of place)...if it's pushed out, see if reseating it (and having it stay in place) is possible, because that is clearly important to prevent recurrence. If it cannot be reseated, or if too much heat-damage or carbonization has occurred, replacement of fuseholder is necessary (with another piece of china trash?)...and Kay's Assessment A is possibly correct also (another example of china s**t goods...those guys could f**k up a junkyard!)

ACZP on male terminals of fuse may have helped insertion of terminal as it lubes, instead of allowing force to push out terminal (after that, ACZP protects as we know)...still, design of fuseblock is questionable (poor alignment and position of terminals?) if pushing out of terminal is possible and allowed to happen under any circumstance (see Assessment A)!

Cheers

[Derek UK]

That's a 30amp fuse so should be OK. The current across the fuse does go high when the fan is switched on. Make sure that the fan motor is free running and the motor isn't stiff when at the initial start. 6v fuses are generally twice the value of 12v ones in a similar circuit so 30 amps should be enough. Not unusual for fan fuses to blow now and then but if using one of the rubber type inline blade fuse holders I would replace it. One of the blades of that fuse looks as if it has been arcing.

[Ron Kwas]

arcturus;

Can you post some pictures of what you find when inspecting the FB.

Cheers

[arcturus]

It's not a fuse "block" It's a rubber single fuse holder, splash proof,with a led indicator for blown fuse.

[Ron Kwas]

arcturus;

OK...so that should make inspection even simpler...but it might (I actually expect it to) be completely overmolded and encapsulated, so this might not be possible without opening it up...if it was me, I'd replace it and cut apart the offender for a post-morten and for the sake of knowledge...otherwise, explanations and recommendations still apply.

Cheers