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Sherlock Ohms

Always Inspect the Fuses

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tekochip
User Rank
Platinum
Re: Not Always Open
tekochip   9/20/2014 8:20:26 AM
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Common Sense is a skill that should never be overlooked.  Would you really want to hire the guy that destroyed the whole box?

bobwojo48
User Rank
Silver
Re: Not Always Open
bobwojo48   9/18/2014 9:51:31 PM
I had a co-op assignment at the Ford engineering center in the early 70's in the radio lab.

The technicians there built a "fuse tester" that they liked to give to co-op engineers to test fuses.  They would give student engineers the tester and a box of fuses to see how many they would blow before they figured out the "tester" was just blowing all the fuses.

I'm proud to say I figured it out after just a couple failures.  They told me some students would go through the whole box and report that they were all bad...And they were right.

Bill-Devine
User Rank
Iron
Re: Not Always Open
Bill-Devine   9/18/2014 6:10:58 PM
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Not a procedure just what the inspector thought was the right thing to do.

tekochip
User Rank
Platinum
Re: Not Always Open
tekochip   9/18/2014 6:09:25 PM
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That's a great story Bill-Devine.  Was he following a procedure that somebody wrote?

AREV
User Rank
Gold
Re: Not Always Open
AREV   9/18/2014 3:42:02 PM
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Same w/ Light bulbs. Monday I notice a fog lamp on my Dakota was not functioning. I purchased a new light, installed it - still no work. I was ready to chase the wiring but got out the meter and new light was as dead as the old one. I switched the functioning one into the burnt out one, it worked. I returned the $12 defect and got a replacement, installed it in the parking lot and Voila. Light.

Bill-Devine
User Rank
Iron
Re: Not Always Open
Bill-Devine   9/18/2014 3:36:08 PM
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When I first read the title it reminded of an occassion where a technician ordered fuses from the stockroom to replace ones that had blown.  He replaced the fuses and the unit he was testing would not power up.  He checked the fuses and they were blown.  He ordered and replaced again and they were blown.  He was thinking what the heck was going on.  He ordered more and measured them before installing and they were blown.  All of the fuses in stock were blown.  It turns our that the incoming inspector was testing the fuses to see that they worked and blew up all of the fuses and said they were good so put them into stock.

Cabe Atwell
User Rank
Blogger
Re: Not Always Open
Cabe Atwell   9/9/2014 9:49:58 PM
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That was great, I don't know how many times I pulled a device completely apart only to find the issue was something simple and I didn't need to disassemble everything.

tekochip
User Rank
Platinum
Re: Not Always Open
tekochip   9/9/2014 4:18:26 PM
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Great story, and an Opel GT makes it even better!

Larry M
User Rank
Platinum
Re: Not Always Open
Larry M   9/9/2014 3:51:22 PM
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I had a fuse in a 1970 Opel GT which failed with a hairline crack due to vibration. It would run the radio but as soon as I turned on another accessory it would open. If I turned the entire car off it would heal--repeatably.

It took about an hour to find. My visual inspection showed that the element wasn't flat--it was V-shaped, but didn't reveal the crack. It wasn't until I was crawling around under the dash and happened to have my worklight behind the fuse that I could see the hairline crack.

William K.
User Rank
Platinum
Re: Not Always Open
William K.   9/7/2014 8:35:32 PM
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The one certain thing that you can learn from a visual inspection of a fuse is if it failed from a direct short circuit, which usually results in evaporated fuse element coating part of the glass inside.  That is handy for diagnostics and useful in preventing the waste of replacement fuses prior to removing the short circuit.

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