On my way home from work I stopped at one of the remaining radio shacks and grabbed some leds and resistors. I got 3 red 5mm leds, one 3v, one 1.7v, and one 3v blinking.
I first tested them a p60 light using a single mode AX2002 driver and an XM-L.
I put the 3v led in parallel to the main switch with the positive led lead connecting to the battery tube. I did not use a resistor.
It works perfectly! With the switch open, the led lights up to a nice locator brightness. I measured with my DMM in series with the led and they pull about 0.5 miliamps. The XM-L does not light.
When when the main switch is closed, the secondary led shuts off and the main led works normally.
Next I tried it with a 4-mode solarforce drop-in with an xp-l, and a 4 mode custom dropin with one of wight’s PZL drivers and a Nichia.
With the switch open, the secondary led works as expected, the Nichia lights an almost invisible amount, but the xp-l does not light at all. The secondary led seems brighter with the PZL driver.
With the switch closed, the secondary led goes dark and both main leds come on, but neither changes modes.
So I retested these two the same way, but with a 1kohm resistor in series before the + end of the led. With the switch open they both act the same, but this time the solarforce drop-in functions perfectly, changing modes without a hitch. When I turn on the custom drop-in, it goes into lvp, a few blinks and then off.
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I’ll test with the blinky led next