The set up in the 40 is that if it thinks a bulb is burnt out the flashers won't work to let you know. It detects this (I think) by resistance. If you wired in something in place of the OEM stuff, then it needs to mimic the resitance of the old setup to work.
That's my guess, someone correct me if I am wrong.
Electronic flasher should flash no matter what. More info would help. Do the fronts flash? Do the LEDs light up? Maybe it is not an electronic flasher or the LEDs are wired incorrectly.
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