Flasher Relay mod for LED bulbs.

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Flasher Relay mod for LED bulbs.

04-07-2014, 07:33 PM

300SD81

1981 Mercedes-Benz 300SD

Join Date: Aug 2006

Location: University of Georgia

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Flasher Relay mod for LED bulbs.

Took a little work to figure this out, so thought I'd share for anyone interested.

The flasher relay can be modified pretty easily to flash at a normal rate with LEDs.

2x 1-ohm resistors (in parallel) are put in series with the 30-milliohm sense resistor, so the U243B chip detects a higher voltage drop and flashes normally.

Note that this makes it no longer function and possibly overheat if you use normal bulbs, but it is easy enough to undo or even drill the relay casing and wire a switch to change between.

Last edited by 300SD81; 04-07-2014 at 07:45 PM.

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