Re: 1999 JGCL running break lights not working
Welcome to the garage.
Many times the problem are the light sockets. Try to bend the small copper tabs out a little bit. For the third brake light, if the light bulb is ok (check with ohm meter), i would check with a voltmeter to see if voltage is available at the socket when braking. If it is, then check the ground side with an ohm meter.