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LED Strip connected to car 12v port and isn't lighting up? Answered

So i bought an LED strip which was rated at 12V, i connected it to the wall and they lit up, i then got a car charger which was 12V and wired it up, and they don't light up. The car charger itself has its indicator LED glowing and i checked with a voltmeter that it was supplying the 12V.
I cannot seem to figure out for the life of me why they aren't lighting up? Any ideas?

Discussions

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-max-
-max-

3 years ago

Modern car chargers are too smart to fool like that. They generally detect if there is a reasonable load on the terminals before enabling charging. I thought I could test out some headlights this way since I was not close to a real power supply and I thought my lamps were dead until I discovered the charger does not do anything until it is connected to a battery.

Also make sure the polarity is correct. LEDs do not work with reverse polarity.

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Downunder35m
Downunder35m

3 years ago

Some car chargers need an actual battery as the load, the strip might not register for the electronics.
Older style chargers with a normal transformer in it usually only provide a basic DC voltage with little filtering - which is fine for a battery but bad for LED's.
The no-load voltage can also be quite high and destroy the strip.
With the cost of dedicade 12V wall warts I fail to see why you would not use something proper instead....

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iceng
iceng

3 years ago

On the possibility of car charger as the problem... What is the car charger output current ? . . A pointer to the product would help.

Or measure if there is12v to your strip while running the strip.

Why not run the strip on the car 12v system ?