74BroncoCO
Bronco Guru
- Joined
- Nov 3, 2004
- Messages
- 2,374
I installed some LED headlights and they are not working properly. I think one is partially blown because it doesn't work on High Beams and low beams are very dim.
I've done some research and determined what the pins are. I think this is correct...
Drivers side, looking at the female connectors, the right side is high beam, Top is Low beam, and the left is ground.
Passenger side is a mirror, with the ground being on the right.
First thing I notice is that the LED transformer connectors, the black wire is in the same position on both connectors, so it doesn't mirror. I assumed the black wire was ground, so I am not sure how this affects the headlights? Probably not at all since factory bulbs did not differentiate between driver or passenger side??
Below are my results and I am hoping someone can say that this looks good, or that I have an issue and hopefully how to address it!
My first concern is seeing voltage at both pins for both high and low beams. Do I have a bad switch? Thanks!!
This is the Voltage at each pin for these given scenarios:
Passenger side:
@ factory connector with:
headlights off
Low = 0
High = 0
Low Beam
Low = 12.4
High = 4
High Beam
Low = 12.6
High = 12.3
@ Transformer connector:
Headlights off
Low = 0.1
High = 0
Low Beams
Low = 12.4
High = 4
High Beams
Low = 12.8
High = 12.3
Driver side (one that doesn't work correctly)
@ factory connector with:
headlights off
Low = 0
High = 0
Low Beam
Low = 11.9
High = 0
High Beam
Low = 0.4
High = 11.4
@ Transformer connector:
Headlights off
Low = 0.1
High = 0
Low Beams
Low = 12.
High = 0
High Beams
Low = 7.5
High = 11.7
I've done some research and determined what the pins are. I think this is correct...
Drivers side, looking at the female connectors, the right side is high beam, Top is Low beam, and the left is ground.
Passenger side is a mirror, with the ground being on the right.
First thing I notice is that the LED transformer connectors, the black wire is in the same position on both connectors, so it doesn't mirror. I assumed the black wire was ground, so I am not sure how this affects the headlights? Probably not at all since factory bulbs did not differentiate between driver or passenger side??
Below are my results and I am hoping someone can say that this looks good, or that I have an issue and hopefully how to address it!
My first concern is seeing voltage at both pins for both high and low beams. Do I have a bad switch? Thanks!!
This is the Voltage at each pin for these given scenarios:
Passenger side:
@ factory connector with:
headlights off
Low = 0
High = 0
Low Beam
Low = 12.4
High = 4
High Beam
Low = 12.6
High = 12.3
@ Transformer connector:
Headlights off
Low = 0.1
High = 0
Low Beams
Low = 12.4
High = 4
High Beams
Low = 12.8
High = 12.3
Driver side (one that doesn't work correctly)
@ factory connector with:
headlights off
Low = 0
High = 0
Low Beam
Low = 11.9
High = 0
High Beam
Low = 0.4
High = 11.4
@ Transformer connector:
Headlights off
Low = 0.1
High = 0
Low Beams
Low = 12.
High = 0
High Beams
Low = 7.5
High = 11.7
Last edited:
