Electrics: - High level brake light

geordierebel · Mar 4th, 2011, 00:18

can anyone tell me why should the high level brake light on my s40 {2004} have gone dim please

sebaveh · Mar 4th, 2011, 18:51

-Not enough voltage to it: if it gets far less than battery voltage, then you got a weak contact somewhere.

-Weak solder joint somewhere on PCB where LED's and resistors are soldered

-Heat damage_ LED's are sensitive to higher temparatures (over 70°C), even when they are not lit. This cause permanent damage to them.

-Too high voltage on whole electrical system and brake light. Car may suffered alternator overcharge before, so LED's felt overcurrent through them. This also cause permanent damage.

v8 rick · Mar 4th, 2011, 19:32

first place i would be looking is the wiring in the trunking at the top of the tailgate .

rick.

Mar 4th, 2011, 00:18	#1
geordierebel New Member Last Online: Feb 11th, 2012 10:23 Join Date: May 2007 Location: norwich	High level brake light can anyone tell me why should the high level brake light on my s40 {2004} have gone dim please

Mar 4th, 2011, 18:51	#2
sebaveh Winegrover Last Online: Jul 17th, 2019 11:08 Join Date: Nov 2009 Location: Slovenska Bistrica	-Not enough voltage to it: if it gets far less than battery voltage, then you got a weak contact somewhere. -Weak solder joint somewhere on PCB where LED's and resistors are soldered -Heat damage_ LED's are sensitive to higher temparatures (over 70°C), even when they are not lit. This cause permanent damage to them. -Too high voltage on whole electrical system and brake light. Car may suffered alternator overcharge before, so LED's felt overcurrent through them. This also cause permanent damage.

Mar 4th, 2011, 19:32	#3
v8 rick Member Last Online: Apr 2nd, 2016 15:20 Join Date: Dec 2010 Location: bolton	first place i would be looking is the wiring in the trunking at the top of the tailgate . rick.

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