Bob Ayers
Well-Known Member
I don't agree it's about current flow under LOAD.
there are problems that cannot be detected with a DVM
and an LED test lamp draws too little current to generate
a load.
Yes, they are reliable, but...
There are many times when a DVM showed the correct voltage an an LED test lamp lit, but an incandescent bulb would only come up dim, thus identifying the problem
BTW, if you have a Snap-On test light that uses the lightbulb that looks like an old style glass fuse and you are shocked by the price of a replacement bulb (if your snap-on dealer is actually willing to get you one)
you can get the replacement bulbs cheap.
Go to your nearest U-pull-it junkyard and steal the light bulbs out of the lighted vanity mirror in any gen1 or Gen2 Explorer
AD
The response time of the LED is much faster than the incandescent bulb.
If it's a load issue (or series resistance), the test light incandescent bulb doesn't draw enough current either.