Hi there, guys, and greetings from Chile... I wanted to share some of my wisdom and experience with you, in regards to Broncolectricity... if some of you ever had this problem, here's the solution...
Sometimes, when the headlights are turned on, some of the parking (position) lights, or all of them, turn off... what happens is that, the switch has two terminals for the parking lights, detailed in the diagram below: terminal P and terminal R.
It says that terminal P is unused, and this is true, but not entirely accurate, since this P terminal is hot (with electricity) when the lighting switch is pulled to the 1st position (parking lights on), but, when the lighting switch is pulled to the 2nd position (headlights on), this P terminal has no power, and this is by design: many, if not all of these Ford lighting switches, used in Bronco's, Mustang's and other Ford vehicles, work very much in the same way; this means that anything that is connected to this P terminal will turn on when the switch is pulled to the 1st position, but will turn off when the switch is pulled to the 2nd position.
On the other hand, on some Early Bronco electrical diagrams, it says that there are two wires, and both wires are brown (chocolate like) in color; according to these diagrams, one of them goes to the front position lights, and the other one goes to the rear position lights. This is not accurate either, because in reality, there are two wires, but different in color: there's a thin wire that is black with a yellow stripe, which goes to the front position lights, in many cases connected to terminal P, and the other wire that is brown (chocolate like) in color, which goes to the rear position lights, and is connected to terminal R.
If the first wire (black with a yellow stripe) is connected to terminal P, the front parking lights will turn off when headlights are turned on; conversely, if the second wire (brown) is connected to terminal P, the rear parking lights will turn off when headlights are turned on.
So, the solution to this problem is quite simple: just put the two wires together, and connected to the R terminal, which will be hot (with electricity) in both 1st and 2nd position of the lighting switch... of course, we could connect these two wires to the I terminal, but if we turn the dimmer, position lights will be dimmed as well... therefore, always connect the two wires to the R terminal.
Sometimes, when the headlights are turned on, some of the parking (position) lights, or all of them, turn off... what happens is that, the switch has two terminals for the parking lights, detailed in the diagram below: terminal P and terminal R.
It says that terminal P is unused, and this is true, but not entirely accurate, since this P terminal is hot (with electricity) when the lighting switch is pulled to the 1st position (parking lights on), but, when the lighting switch is pulled to the 2nd position (headlights on), this P terminal has no power, and this is by design: many, if not all of these Ford lighting switches, used in Bronco's, Mustang's and other Ford vehicles, work very much in the same way; this means that anything that is connected to this P terminal will turn on when the switch is pulled to the 1st position, but will turn off when the switch is pulled to the 2nd position.
On the other hand, on some Early Bronco electrical diagrams, it says that there are two wires, and both wires are brown (chocolate like) in color; according to these diagrams, one of them goes to the front position lights, and the other one goes to the rear position lights. This is not accurate either, because in reality, there are two wires, but different in color: there's a thin wire that is black with a yellow stripe, which goes to the front position lights, in many cases connected to terminal P, and the other wire that is brown (chocolate like) in color, which goes to the rear position lights, and is connected to terminal R.
If the first wire (black with a yellow stripe) is connected to terminal P, the front parking lights will turn off when headlights are turned on; conversely, if the second wire (brown) is connected to terminal P, the rear parking lights will turn off when headlights are turned on.
So, the solution to this problem is quite simple: just put the two wires together, and connected to the R terminal, which will be hot (with electricity) in both 1st and 2nd position of the lighting switch... of course, we could connect these two wires to the I terminal, but if we turn the dimmer, position lights will be dimmed as well... therefore, always connect the two wires to the R terminal.
