All 3 brake lights won't come on, but all other lights work. This is what I did. Replaced the brake light switch... Replaced tail light relay under hood in fuse box... Checked and replaced tail and brake light fuses under hood and under dash. Tried different bulbs... Checked ground wire under bumper. Unplugged brake light switch plug and checked with multimeter, checked all contacts with probes and there was no voltage. Help!!!!!!!!!!! I have no idea what to try next. Brake lights always work without ignition on. Not now.