Stumbled across this on
Fleabay Motors. It's a voltmeter that you can plug
into your car's cigarette lighter socket to check the
Thought something like that would
be handy for checking the batteries on my K bikes but of
course nobody makes one in a Powerlet plug version so I
decided to make my own.
The body of it is one of these
dual use plugs you can get on Fleabay for $1.98 shipped.
When you pull the red cap off of the tip it fits into a
(BTW: I don't recommend
this type of plug. I bought this to see if they were
worthwhile. It will work fine for this application but
better ones can be had. There's a UK seller on FleaBay,
AutoStar, that has some better ones for a reasonable price.)
Then I found this mini LED
voltmeter that's powered by the voltage it's testing.
I drilled some small holes it the
sides of the plug and used some fine brass wire to hold the
LED in place on top of the plug.
Then I put the plug back
together, wrapped some tape around the top of the body of it
and filled that with five minute epoxy to "ruggedize" it.
Here's the final product:
It's not particularly attractive
but it works great and is much easier than using a
multimeter to check the battery voltage.
© 2013 Drake Smith - Please do
not use or reproduce this elsewhere. Feel free to link
to it though.