Quote:
Originally Posted by 3dplane
Start parallelling those 560 ohm resistors. Twist the legs together on each end of two and you should end up with a 280 ohm 1/2 watt resistor.
Do four to get a 140 ohm 1 watt etc.
Or just get a pack that has lower value resistors so you don't have to parallel that many.
I'm guessing you will only need a few ohms to protect them from the slight over voltage in your situation!
Trial and error but keep checking current draw for different scenarios (voltage and resistors) and you will get a good picture of what they are doing!
Barna
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I only had 8, got it down to 70 ohm and it's an acceptable brightness, this caused it to drop down to 7.8volts measured after the resistors, I can still notice that it's less bright than at 12v so I think I'll try and pick up some 10, 15 and 20 tomorrow.
Thank you everyone for all the help, my university education is actually starting to come back to me.
It might not even need a resistor on this new car since Kia has what they call a smart alternator and it only runs around 14 volts most of the time, 14.2 under load. It may have been the high voltage only from the high end of the revs in the older cars that killed it.