3rd tail light
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 862
Likes: 0
From: Lewisvlle NC
3rd tail light
Still trying to track down why my 3rd tail light won't work. Have replaced the switch, all bulbs are good. Have taken off the interior of the halo to check the ground. Connected to the wiring of the light, inside of the halo, is a two wired vented black box approximately 3/4" x 2". Terrible discription of it, but does anyone know what this thing is or does. 1988,35th.anni. Thanks
Melting Slicks
Joined: Jan 2009
Posts: 3,181
Likes: 286
From: Puyallup Washington
Have you done any troubleshooting or did you just replace parts on a guess? When you say you have replaced the switch are you talking the brake switch or the light switch?
First, do you get 12 V at the light sockets when the brake switch is turned on?
Do you get the lights to work by running 12V directly to the light sockets, bypassing the black box?
If they work, then the ground is good. If not, fix the ground or the sockets.
Do you get 12V going to the black box when the lights are supposed to be on? If not, check the circuit going to the black box. Unfortunately, I have a 1992 so I do not know what the black box is.
First, do you get 12 V at the light sockets when the brake switch is turned on?
Do you get the lights to work by running 12V directly to the light sockets, bypassing the black box?
If they work, then the ground is good. If not, fix the ground or the sockets.
Do you get 12V going to the black box when the lights are supposed to be on? If not, check the circuit going to the black box. Unfortunately, I have a 1992 so I do not know what the black box is.
Team Owner
Joined: Sep 2003
Posts: 25,386
Likes: 2,740
Still trying to track down why my 3rd tail light won't work. Have replaced the switch, all bulbs are good. Have taken off the interior of the halo to check the ground. Connected to the wiring of the light, inside of the halo, is a two wired vented black box approximately 3/4" x 2". Terrible discription of it, but does anyone know what this thing is or does. 1988,35th.anni. Thanks
