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Remove the tail light assemblies and unplug them from the truck. Then check for 12v between the pins in the plug and a ground point on the body when you have the tail lights on and when someone is pressing the brake pedal. Report back on which pins (i.e. which wire colours) show voltage under those situations.
Remove the tail light assemblies and unplug them from the truck. Then check for 12v between the pins in the plug and a ground point on the body when you have the tail lights on and when someone is pressing the brake pedal. Report back on which pins (i.e. which wire colours) show voltage under those situations.
I unplugged the light assembly and tested the plug/pins coming from the truck. I get power (about 12-14v) in 3 of the 4 pins as I take an action (headlights, brake, blinker.) Fourth pin never shows power, so thinking its a ground. Whats this all mean?
The wire going to the brake light terminal should be green/purple. The wire to the tail light should be red/orange (right hand side) or red/black (left). If the correct wire colours correspond to the terminal positions in your picture above, then the problem is either inside the light assemblies themselves (unlikely that both would fail in the same way at the same time) or the bulbs are wrong.
The wire going to the brake light terminal should be green/purple. The wire to the tail light should be red/orange (right hand side) or red/black (left). If the correct wire colours correspond to the terminal positions in your picture above, then the problem is either inside the light assemblies themselves (unlikely that both would fail in the same way at the same time) or the bulbs are wrong.
The 4 wires are as follows: (this is my drivers side with has the problem. The passenger side is ok.)
* Brake wire is green/purple
* Blinker is green
* Headlight is red
* ?? one Is black
does this sound correct?
You mention a tail light, but i think you mean headlight, right?
Since you're referencing brake lights, I assume that you are working at the back of the truck. There are no headlights at the back, so tail light is correct. Tail lights come on with the marker lights when you turn the switch to the first position; headlights only come on when you turn the switch to the second position.
It does sound like your wires are the correct colours, which leads us back again to the bulb mounts or the bulbs themselves.
You ARE using bulbs with two filaments in the brake/tail socket, right? Like this? There should be offset locating pins and two contacts on the bottom.
Yes, its the rear light assembly in question. I call it the headlight bulb/socket because it comes on when you turn on the headlights. You cal it the tail light, which is probably more accurate... its the same socket.
Im using bulbs exactly like your picture. In fact i swapped bulbs with the passenger side and the same thing occurs, so its not the bulbs.
10-28-2023, 06:09 PM
