Chevrolet Repair: electrical issues, circuts, electrical issues

Question
when I put my headlights on the tail lights do not work and the turn sighals act up when the breaks are applied (the hazards turn on). I have put new circut boasrds vin the tail lights and a new break switch no luch yet.

Answer
Hi Ted.... disconnect the tail lights and check the circuts...if they work ok without the lights plugged in check the grounds.if they don't trace the circuts and look for shorts to ground. also check the 4 way flasher see if it is shorting to ground.remove it and try your lights. if ok then problem is in the flasher or the circut...hope this helps...merry christmas