- Dec 11, 2005
- too many
The problem with using more wattage bulbs is overloading your existing wiring. You could easily build a relay harness, or buy one even. You will get brighter lights that way and save from burning up your wires.
Probably not a problem on your relatively new Volvo, but on older cars where the whole electricity for the lights has to run via the light switch the voltage might suffer, not to say the light switch itself. I installed a relay on my Fiat, my brother on his Ford, light has improved dramatically.
Your car might already have a relay in the circuit, but it's almost no work at all to measure the voltage at the headlamp plug.