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I installed new headlights today and the headlight bulbs are not lighting. When I turn the headlight's on the high beam indicator remains lit no matter if the high beams are on or not. I should note that this style headlight has a separate bulb for low and high beams. I am skeptical that all four headlight bulbs are bad. Is it possible the wiring for the connector is not correct?
Need some more information. What headlights, and year of your truck? No EX has separate high and low bulbs. What did the manufacture give you for wiring? are they supposed to be plug and play? I had some like that and they need to be wired separately from your current plug.
Well I just looked up the ones for my truck and they are what I used to have or very similar. The previous owner had them on there, but they were not plug and play. They had wires jumpered from the OEM harness to the harness on those lights. Could be my browser at work, but I do not see where they are plug and play. I did find this from another website..."Designed to be an exact replacement for your factory lights, however some electrical wiring work may be required; most lights come with detailed installation instructions"
I have attached a photo of the rear of the light. You can hopefully see the blue connector. There are four wires coming from that connector. 2 black in the middle, a red on one side and a blue on the other side. One black wire goes to each of the two bulbs. One bulb is joined with the red and the other bulb is joined by the blue.
When the headlight is connected the dashboard high beam indicator is always lit whether or not high beams are on.
When the headlight is disconnected the high beam dash indicator operates properly.
The new lights have an H1 bulb for the high beam and a second H1 bulb for the low beam.
Unplug the headlights and take a multi meter or a test light test the factory headlight connection for voltage. There should be 1 ground and 2 for voltage.
If you look at the new headlights you will see 2 wires in the middle those are ground then you see 1 red and 1 blue. Those will be the positives for the high and low beams
1. Check your fuses
2. Test the factory headlight harness with low beam first and see which is the power for low then on the same plug see which is the power for high.
3. Take the ohm meter and measure if the 2 wires on the new light plug that aren't spliced together have any resistance. They should say OL. Do this for both new light harnesses and report back.
theoretically the positives will be on the outsides of the oem plug just like they are on the aftermarket one
Well two suggestions. Disconnect one headlight at a time and see if they will work, maybe one is bad. The other is maybe a headlight bulb is shorted causing the problem...
I'm willing to bet one of the aftermarket headlight harnesses when you ohm will show resistance and they shouldnt except the 2 black wires to each other
I checked the factory connector with with lights on. With the locking connector facing up the low beam was on the right side. I tested bit low and high beams and have just under 12 volts on each (when high beams on).
I tested with the ohm meter. This is new for me so I may have screwed it up. I set the ohm meter to 200 ohms and put the black test probe on the center and the red on the left most connected. I got a reading of 1.0 that slowly drops to .8.
Setting the ohm meter doesn't matter what selection as long as it's ohms.
The red and blue wires should read OL when you have one test lead on the red and the other on the blue.
Then do that same test with 1 on the grounds and the other on the blue then do the same on the red.
****EDIT***
THE BLUE TO BLACK OR RED TO BLACK WILL READ OHMS.
Sorry was typing while watching my kids swim
Thank you all. I ran a lead straight from the battery to the headlights and they worked. I inspected the connector on the car side and it looked fairly cruddy. I took a small flat head screwdriver and cleans out /roughed up the contact areas. Reconnected the lights and they now work.
Good deal. I would buy some battery terminal cleaner and clean out that socket. It can end up being a much bigger problem if you don't neutralize the corrosion.
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