Same. Another instance that comes to mind are alternators that use a warning light instead of a voltmeter/ammeter. The field is energized through the filament of the incandescent bulb, and if the bulb is removed, the alternator won't charge. Sure, you could engineer a circuit that would allow you to replace the resistor (bulb) with a LED... but what exactly are you gaining besides more work for yourself? I don't think I've ever encountered a burned out idiot light... I suppose if you drove around for a couple thousand hours with no oil pressure or the engine overheating, it technically could happen... but...
Drop-in LED's can create a fair amount of issues with modern vehicles too. I was recently following a newer F150 with LED's in the cargo lights that were flickering and flashing as it was driving down the road at night... The LCM wasn't playing nicely with whatever was in those sockets. I've seen stuff like this before on other late model vehicles too. And bodges like plonking huge resistor blocks on your turn signal circuit, or other stuff to try and trick on board electronics into not noticing the modifications you've made, makes me cringe. I guess I just run into enough problems to contend with on a daily basis to not go out of my way to make more. Just my take...
Bulb bases(194s especially) often are cheap, poor fitting in bulb sockets. the wires running on each diagnol often are brittle too. the circuit boards are absolute chinesium, the LED chips of so many questionable qualities.
Vehicles that use the resistance of a circuit to detect outage see no resistance when LEDs come into play, almost any.
if you buy quality bulbs they hold up
Also, polarity switching for things like turn signals dont play well with led because typically an LED bulb has to be inserted one way. look at these
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the red are LED, they light faster, they are brighter, they are "dual" filament and the action of brake and then back to tail or off looks good. They fill the light housing better
My amber turns are incandescent. With 4 rear 3157 bulbs to have to resistor each, it makes a lot of heat that I would have to do a lot of work to run them far enough and safely enough away that I didnt do it yet.
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Trunk light sucked before
Its good.
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SOME of these LEDs are the cheaper, some arent. doesnt bother me, but I absolutely couldnt live without my daylight interior anymore, door lights, and puddlecourtesy light on the front 2 doors