i have a set off 50w 6000ks fitted but the drivers side light will not light ive changed bulbs and tried in a friends car everything works fine ive dropped them down to a set of 4300k it will light but i have to turn them on before i start the engine and tbh theyre not very bright ,i know i need a new battery as 5 mins with radio on but engine not running turns everything off and struggles when it cranks over. could the battery be the problem