Melted (not blown) alternator 100A fuse

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Thunderscreech
Posts: 82
Joined: Wed Nov 25, 2009 7:35 am

Melted (not blown) alternator 100A fuse

Post by Thunderscreech »

I've got a weird one with a theory is like to run by y'all. I've had to replace my 100 amp alternator fusible link a couple times burnout because the filament burned out; the whole thing got HOT and the plastic socket it mounts to melted and charred!

I cleaned out the plastic, cleaned the bolts they link to, then replaced it after auditing for shorts. Everything was fine for a year then it happened again. The filament is fine but the prong for the link on the engibe side got reall hot and melted just that side.

My theory: I may have a bad wire or connection on that side and the resistance is turning that post into a heating element.

How crazy does that sound? Or should I be considering other causes?
2003 Bare Bones
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vibrologist
Posts: 1598
Joined: Sat May 10, 2014 8:24 am
Location: Iowa

Re: Melted (not blown) alternator 100A fuse

Post by vibrologist »

I don't think that is crazy at all. Some mechanics use infrared thermometers to locate shorts.
Vibrologist
'05 Vibe

"It is important to know the difference between 'accurate' and 'precise' even if you are neither!"

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beemerphile1
Posts: 505
Joined: Tue Jul 14, 2009 12:12 am
Location: NE Ohio

Re: Melted (not blown) alternator 100A fuse

Post by beemerphile1 »

A poor connection causes arcing,

arcing causes heat,

heat melts things.

You need to replace both sides of the connection.
NE Ohio - home to the most successful Pontiac drag racing team in history - Bill Knafel's "Tin Indian" and also home to Summit Auto Racing.
2009 Vibe base 1.8L auto towing 2009 Aliner Sport hardsided pop-up
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