Why do my high beams work but not my headlights?

Why do my high beams work but not my headlights?

All bulbs are plugged into a socket. Corrosion, a bad ground, or some other issues can damage the sockets and disrupt the power flow to the bulbs. If only the sockets of the low beams are bad, it will cause headlights not working but high beams are. It is unusual for both sockets to be damaged at the same time.

What would cause my low beam headlights not to work?

Solution: If both headlights aren’t working, it’s unlikely that a bulb is at fault. The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. About the only cause that is an easy fix is a blown fuse.

What would cause headlights not to work?

Most total headlight failures are caused by a bad component like a fuse, relay, or module. Wiring problems can also cause both headlights to stop working. High beam headlights don’t work or low beams don’t work. The cause: A burned out bulb, or a problem with the high beam switch or relay.

How do you fix high beams not working?

Reason #1: Blown Fuses or Bad Replays Or, it could be a bad relay. If the headlight relay has failed, it may not respond when you attempt to switch the high beams on. Replacing the relay should restore the system and get your high beams working once again.

How do you check a headlight relay?

How Can I Test a Headlight Relay?

1. Turn on Your Lights. Turn on your lights.
2. Listen for the Click. Open the hood, locate the fuse box with the headlight relay or relays, and open it.
3. Replace the Relay. Have an assistant turn on the headlights.
4. Multimeter Tests.

How do you bypass a headlight relay?

Headlight relay has four wires going to it. Colors are White, Black, Blue/Black and Red/Yellow. (Turn signal relay has three wires). You can bypass the relay (light on with key on) by connecting the Blue/Black wire to the Red/Yellow wire.

How can you tell if a relay is blown?

The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).

How do you tell if a relay is normally open or closed?

As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized. In either case, applying electrical current to the contacts will change their state.