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LED turn flasher lamps

Former Community Member
Former Community Member

Good day, folks ?
I've just started changing my rear light cluster to LED bulbs (bulbs go in the ground). And the tail/stop is ok, reverse is ok but when I put the turn/flasher lamp in the lamp holder and fit the flasher unit stops flashing and the lamp just stays on. Now from my point of view it may well be that the load is less and therefore the flasher relay cannot charge the capacitor enough to switch the coil but has anyone had this issue or should I just try another LED lamp. BTW, I also use the LED Series Resistor Calculator to identify the value of current limiting series resistor when driving an array of LEDs, I'm not sure if this calculation is appropriate...I'm not an electrician, so there may be errors.

Has anyone a recommendation for an LED that still looks like a lamp and not a unit with lots of flat LED flat cob dots. Any replies will be appreciated.

Thank you in advance!

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    Beware also of the generation of vehicles designed very roughly 1990s to 2000s. In my limited personal knowledge Volvos & Mercedes. The flashers are electronically controlled by an ECU, no flasher unit, and pretty much current insensitive. But the (I forget the exact term) smart MOSFETs used as drivers have monitoring built in for O/C, low current, S/C. So your LED bulb (sans shunt) works perfectly. But the dash shows a fault code. Annoying, masks real faults, and I suspect an MOT fail. 

    On my MB Vito I substituted one number plate bulb (5W) for an LED in order to squeeze a camera alongside. Worked but fault reported. Had to shunt it, accurately. And yes, even a 5W shunt required careful placement to avoid overheating (I had to make a void in the motorhome insulation).

    I worked on the Volvos & Astons - later versions may have garage settable options to tell them that LEDs are fitted and suppress specific fault detection/reporting. Don't know of other brands.

    HTH

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    Beware also of the generation of vehicles designed very roughly 1990s to 2000s. In my limited personal knowledge Volvos & Mercedes. The flashers are electronically controlled by an ECU, no flasher unit, and pretty much current insensitive. But the (I forget the exact term) smart MOSFETs used as drivers have monitoring built in for O/C, low current, S/C. So your LED bulb (sans shunt) works perfectly. But the dash shows a fault code. Annoying, masks real faults, and I suspect an MOT fail. 

    On my MB Vito I substituted one number plate bulb (5W) for an LED in order to squeeze a camera alongside. Worked but fault reported. Had to shunt it, accurately. And yes, even a 5W shunt required careful placement to avoid overheating (I had to make a void in the motorhome insulation).

    I worked on the Volvos & Astons - later versions may have garage settable options to tell them that LEDs are fitted and suppress specific fault detection/reporting. Don't know of other brands.

    HTH

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