I put blue LED 906 flashers in the 3 pop bumpers on a Scared Stiff, and when testing 1 flasher at a time all 3 fire at the same time, also if I remove the LED from the top bumper the other 2 stop working.

While trying to figure out what's going on, I replaced all 3 with regular 906 bulbs and everything went back to normal - no issues. Anyone have any ideas?

EDIT (More Info) - Here is a compact way to show test results...

Bulb Config: Top=bulb, Mid=bulb, Btm=bulb (ALL bulbs)
- Top: Y-n-n // Short hand indicating which bulbs flash for Top Jet test - Top/Mid/Btm
- Mid: n-Y-n
- Btm: n-n-Y

Bulb Config: Top=LED, Mid=LED, Btm=LED (ALL LEDs)
- Top: Y-Y-Y
- Mid: Y-Y-Y
- Btm: n-n-n

Bulb Config: Top=bulb, Mid=LED, Btm=LED
- Top: n-Y-Y
- Mid: n-Y-n
- Btm: n-n-Y

NOTE: I've tried reversing the LEDs but that doesn't seem to make a difference.

I don't think so, but right now the game is mostly apart as I'm shopping it so I'm only using the flash test mode.

If I flip the flippers in test mode, it doesn't seem to affect the flashers at all.

At this point I've settled on the idea that the LEDs are causing the issue, and that it could possibly be fixed by adding diodes to the flasher connections to prevent "leak back" of electrical current. This doesn't seem to be a problem with bulbs, just LEDs. I'm just going to stick with all bulbs for the flashers for now. Thanks for the help.