The Ram 1500 is a popular full-size pickup truck that has been around for generations. The latest version of the Ram 1500, the 2019 model, comes with a range of new features, including a new wiring system for the headlights. In this article, we will look at the 2019 Ram 1500 headlight wiring diagram, including how to read it, what each component does, and some common FAQ about the headlight system for the Ram 1500.
What is a Headlight Wiring Diagram?
A wiring diagram is a schematic representation of the electrical circuits in a vehicle. A headlight wiring diagram shows how the various components of the headlight system are connected together. This includes the headlight bulbs, wiring harness, relays, and switches.
Reading a headlight wiring diagram can be daunting, especially if you are not familiar with the various electrical components. However, with a little patience and a basic understanding of electrical systems, anyone can read and understand a headlight wiring diagram for the Ram 1500.
How to Read a Headlight Wiring Diagram
A headlight wiring diagram is made up of various symbols and lines that represent the various components of the headlight system. Here are some basic tips for reading a headlight wiring diagram:
- Start by identifying the main components of the headlight system, such as the bulbs, wiring harness, relays, and switches.
- Look for the legend or key that explains the symbols used in the diagram.
- Trace the lines and symbols to see how the various components are connected together.
- Pay close attention to the color coding of the wires, as this will help you identify which wire goes where.
Once you understand the basic layout of a headlight wiring diagram, you can start to troubleshoot any issues you may be having with your Ram 1500 headlights.
Components of the 2019 Ram 1500 Headlight System
The 2019 Ram 1500 headlight system consists of several key components, including:
- Headlight bulbs
- Wiring harness
- Relays
- Switches
Headlight Bulbs
The headlight bulbs are the most visible part of the headlight system. The 2019 Ram 1500 uses high-intensity discharge (HID) bulbs, which are brighter and longer-lasting than traditional halogen bulbs. The HID bulbs are controlled by the headlight switch and relay, which we will discuss later in this article.
Wiring Harness
The wiring harness is a collection of wires that connect the various components of the headlight system together. The wiring harness for the 2019 Ram 1500 headlight system is color-coded to make it easier to identify which wire goes where.
Relays
The relays are electronic switches that control the flow of electricity to the headlight bulbs. In the 2019 Ram 1500 headlight system, there are two relays: one for the low-beam headlights and one for the high-beam headlights.
Switches
The headlight switches are located on the dashboard of the Ram 1500. There are two switches: one for the low-beam headlights and one for the high-beam headlights. The headlight switches are connected to the relays, which control the flow of electricity to the headlight bulbs.
Understanding the 2019 Ram 1500 Headlight Wiring Diagram
Now that we have a basic understanding of the components of the headlight system, let’s take a closer look at the 2019 Ram 1500 headlight wiring diagram.
The headlight wiring diagram for the 2019 Ram 1500 is divided into several sections, each of which shows a different part of the headlight system. Here is an overview of the different sections:
- Section 1: Headlight Bulbs
- Section 2: Wiring Harness
- Section 3: Relays
- Section 4: Switches
Section 1: Headlight Bulbs
The first section of the headlight wiring diagram shows the headlight bulbs and how they are connected to the wiring harness. Each headlight bulb has three wires: a ground wire, a positive wire for the low beam, and a positive wire for the high beam.
In the wiring diagram, each headlight bulb is represented by a circle with three lines coming out of it:
| Circle | Ground wire |
| Line 1 | Positive wire for low beam |
| Line 2 | Positive wire for high beam |
The ground wires for the headlight bulbs are connected to the body of the truck, while the positive wires are connected to the relays and switches.
Section 2: Wiring Harness
The second section of the headlight wiring diagram shows the wiring harness that connects the headlight bulbs to the relays and switches. The wiring harness is color-coded to make it easier to identify which wire goes where.
In the wiring diagram, each wire is represented by a line with a color-coded arrow at each end:
| Line | Wire color |
| Arrow | Direction of flow |
For example, the positive wire for the low-beam headlights is shown as a blue line with a blue arrow pointing towards the relays and a yellow arrow pointing towards the bulbs.
Section 3: Relays
The third section of the headlight wiring diagram shows the two relays that control the flow of electricity to the headlight bulbs. The low-beam relay is shown on the left, while the high-beam relay is shown on the right.
In the wiring diagram, each relay is represented by a rectangle with four lines coming out of it:
| Rectangle | Relay |
| Line 1 | Positive input |
| Line 2 | Positive output |
| Line 3 | Negative input |
| Line 4 | Negative output |
The positive inputs for the relays are connected to the headlight switches, while the positive outputs are connected to the headlight bulbs. The negative inputs and outputs for the relays are connected to the truck’s body.
Section 4: Switches
The final section of the headlight wiring diagram shows the two headlight switches that control the flow of electricity to the relays. The low-beam switch is shown on the left, while the high-beam switch is shown on the right.
In the wiring diagram, each switch is represented by a rectangle with two lines coming out of it:
| Rectangle | Switch |
| Line 1 | Positive input |
| Line 2 | Positive output |
The positive inputs for the switches are connected to the truck’s battery, while the positive outputs are connected to the relays.
FAQ about the Ram 1500 Headlight System
How do I replace a headlight bulb on my Ram 1500?
To replace a headlight bulb on a 2019 Ram 1500, you will need to:
- Open the hood of your truck and locate the headlight bulb you want to replace.
- Disconnect the wiring harness from the back of the headlight bulb.
- Remove the headlight bulb from its housing by twisting it counterclockwise.
- Insert the new headlight bulb into the housing and twist it clockwise to lock it into place.
- Reconnect the wiring harness to the back of the headlight bulb.
How do I troubleshoot a headlight problem on my Ram 1500?
If you are having issues with your Ram 1500 headlights, here are some basic troubleshooting steps:
- Check the headlight bulbs to make sure they are not burned out.
- Check the wiring harness to make sure all connections are secure and free from damage.
- Check the relays to make sure they are functioning properly.
- Check the headlight switches to make sure they are functioning properly.
What do I do if my Ram 1500 headlights won’t turn on?
If your Ram 1500 headlights won’t turn on, here are some steps to follow:
- Check the headlight switch to make sure it is turned on.
- Check the fuses to make sure they are not blown.
- Check the wiring harness to make sure all connections are secure and free from damage.
- Check the relays to make sure they are functioning properly.
- If all else fails, take your truck to a qualified mechanic or dealership for further diagnosis and repair.
