Bill, I had heard that LEDs cause rapid flashing with standard flashers. An incandescent bulb burnt out in a pair wired in parallel does that, as there's more resistance (and lower current flow thru the flasher) over the two in parallel. Oh wait, You said low current caused no flash. I'm getting one of those electrical circuit headaches! LOL!

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.