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Blowing fuse..


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#1 1lo620

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Posted 10 October 2017 - 04:02 PM

Ok so I am blowing a fuse that is obviously hooked to charging. Every time it blows charge light goes on. So I looked under hood didn't see any loose wires. It stopped for about a week. Now charge light comes on and fuse is really hot in fuse block. Any ideas. I am not a electrical guy..

#2 datzenmike

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Posted 10 October 2017 - 04:24 PM

Fuse should not get hot. Clean the brass clips that hold it. If there is resistance it will get hot like a toaster element. If hot enough it will melt the solder inside the fuse glass.


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#3 1lo620

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Posted 11 October 2017 - 03:35 AM

It has that is how I found out how it was hot it melted onto my leg as I was driving. I will clean fuse block. See how that goes

#4 datzenmike

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Posted 11 October 2017 - 04:53 AM

You can also unplug it and remove. Soak in a lemon juice and salt solution over night. (vinegar also works) The mild acetic acid will remove the copper oxidation.
 
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The only problem might be that the heat has taken the spring out of the clips and they don't grip tightly anymore.


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#5 banzai510(hainz)

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Posted 11 October 2017 - 05:26 AM

Ignition fuse I assume.

I reseat the connection related to the ignition side of things.

Was anything added? Different coil or soemthing added.

 

MY last 521 ignition light comming on was a bad alternator. kept popping fuses when I started the truck.

 

those rebuild alternators are just getting worse. I cant get a year out of them anymore


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#6 1lo620

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Posted 11 October 2017 - 12:57 PM

Well in will try to clean fuse block first. See where that takes me.. Alternator next. Thanks Mike and Hainz..between you both and Steve (redeye) you keep my Datsun a rolling...thanks for the help and advice.

#7 banzai510(hainz)

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Posted 11 October 2017 - 01:21 PM

just reseat the connections at alternator also.

anothertime my 521 poped fuses it was the instrument cluster connection


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#8 ]2eDeYe

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Posted 12 October 2017 - 09:50 AM

I totally spaced... sorry about that :) 


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