Puzzler for you electrical gurus....
A year ago I bought a 12v LED light strip (18" long) and mounted in the van I use an another RV. I like it so much I bought a couple more of them to use to mount in my Bigfoot pictured below. These ...
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Rather than use a test light at the source, use a volt meter (digital if you have one) and take an actual reading. If the source is less than 12 volts then perhaps it is enough to power the test light but maybe not enough to run the LED??? I dunno if this makes sense, but I am trying to ascertain a possible answer from the facts you provide.
