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Headlight wiring help.

We just put together a 1984 Nissan 720. The onlt thing wrong is the head lights are really dim. It looks like who ever had this truck before put in a regular pull out headlight switch instead of the one on the steering column. The one one the steering column only worked the park lights for a while. Then I found a broke wire and a cut wire from under dash on what looks like a relay. So I took it apart and soldered it back together. Now the switch on the column works for brights only. But still did not make lights brighter. So I just ordered the conversion kit so I can use a H4 bulb instead of the in-closer when I hooked those lights up the two inner lights came on very dim but on, I turn the brights on they all get a little brighter but not bright, So with that switch on I turned the other switch on and all 4 lights got bright really bright. What would cause all four lights to be on when on dim and what would cause all for to be very bright with both switches on???

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When you say very bright, it sounds like you have both the dim and bright filaments on at the same time. Usually the outer lights have a dim and bright filament, and the inner lights have only a bright filament. What you describe sounds like you are feeding juice to both filaments at the same time.
Let's start with the earth. Take one combination bulb - one that has both dim and bright - out and hold it in your hand. Closely inspect the connections inside and should see four contacts, two for each filament. One one side, you should see two contacts come together as they leave the inside of the bulb to the connector. This is your earth connection. Replace the bulb and check the connector you have just identified. Make sure the wore from this connector has a wire that runs to a good earth connection on the body.
Now the other two connections. One is the dim, the other the bright. There should be a wire that runs from the outer lamp to the inner lamp. This is the bright connection.
Turn on the lights and check the connections with a volt meter, switching between the two positions. In the bright position there should be power on only the bright wire and vice versa. If you have power on both, there is a problem with the dip switch or the wiring.
Look at the color codes of the wires at the outer lamp and trace these wires by color code inside where wires were cut to see if wrong connections were made there.

Posted on Feb 23, 2015

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Check for a loose dirty earth point for the lights. wire not earthed to a pint that is connected back to the battery.

Posted on Dec 06, 2014

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