hi!   i have a nissan march k12 2003 model. i've notice when i turned on the park light or headlight, there is a engine power drop. when running at 100kph, when i switch on the light, the power of the car is dropping even when the gas pedal is floored already. if i switched off the light, the power is back. battery and alternator are ok.   does anyone experiencing this kind of a problem?   thank you in advance!