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Todays Puzzler.The mystery of electricity - Page 3

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Posted by j on June 2, 2012, 3:36 am
On 6/1/2012 8:56 PM, Jim Wilkins wrote:

They do indeed.

Nice trick on their part. As you know, it's not unusual to get a bad
joint in the fuse end caps.

  I caught the 1 Amp fuse with 12 AWG

People make a lot of assumptions that they could simply check out
instead. Often leads to wasted time and money.

I knew this was a bad connection somewhere. As it turns out, two bad


Posted by Vaughn on June 2, 2012, 11:55 am
On 6/1/2012 8:56 PM, Jim Wilkins wrote:

Yes, I learned the hard way.  Early in my career, I spent two days
trying to troubleshoot a simple problem with the tail lights on a pickup
truck.  They had the oddest symptoms!  My meter seemed to be of no help,
giving all kinds of strange readings.  In the end, it totally defeated me!

In desperation I took the truck to a dealer.  They said "No problem!"
When I got it back, I discovered that they had installed a ground wire
between two certain frame members under the truck, which totally cleared
up the problem. They had probably seen dozens with the exact same issue.


Posted by bob haller on June 2, 2012, 3:49 pm
 attention, the new fan should really be on a GFCI circuit. Which
doesnt sound like it is from the OPs description.....

Incidently I replaced all the wiring on a trailer, and had never done
anything like it before. I had my friends box trailer in my driveway
for a few days. I completed the rewire and was very proud when she
came to pick it up.... only problem the lights didnt work.....

traced to a bad ground wire in her nearly new ford commecial van.....

i leared a lot fom that volunteer job....

Posted by j on June 2, 2012, 5:15 pm
 On 6/2/2012 11:49 AM, bob haller wrote:

It is now. It's an unused bathroom with the water off. I wanted a fan in
the window and there are no outlets. I ran an extension over to a
kitchen outlet.

I was in the audio biz at one time and grounds are all important.

  As far as vehicles, grounds are always suspect.

If you clip your volt meter on to a known good ground, and have
everything "on", then you should have near zero volts at other grounds
you test.

It's easier/faster to test volts than resistance. Testing resistance
when you have clear suspects.

   Of course, common problems become known after a while. But, I'm at
the stage in my life that I never want to have the same problem more
than once.


Posted by Vaughn on June 2, 2012, 11:51 pm
 On 6/2/2012 1:15 PM, j wrote:

Yep!  That's exactly what I do.  I've found zillions of bad connections
with a voltmeter.  It's just a simple application of Ohm's law.


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