Hey guys, so my gf has an 01 ford focus. I was driving behind her the other day and noticed her brake lights aren't lighting up. the tail lights are on, and brighter than they should be, but when she brakes they don't get any brighter.
today we checked light bulbs, and fuses, but found nothing, my next though is a relay, but I'm not sure on how to test a relay?
what else would you suggest? thanks!