If you want to connect aftermarket lights or accessories to your Jeep Wrangler’s reverse lights, you need to “tap” into the reverse light circuit. This job sounds simple, but if you are new to car wiring, it can feel a bit confusing.
Whether you want to add backup lights, a camera, or extra safety gear, knowing how to safely tap into the reverse light on your Jeep Wrangler 2017 is key. This guide explains everything step by step, with clear instructions, practical tips, and the most common mistakes beginners make.
You’ll also get tables comparing wire colors, tool options, and alternative methods, so you can make the right choices for your project.
Why Tap Into Reverse Light?
The reverse light circuit is only active when your Jeep is in reverse gear. If you connect accessories like backup lights or a rear camera to this circuit, they will turn on automatically when you reverse. This makes parking safer and easier, and helps others see you backing up. Some owners also use this circuit to trigger alarms or other custom mods. Tapping into the reverse light is the best way to get a reliable signal for these devices.
Understanding The Reverse Light Circuit
Before you start, it’s important to know where the reverse light wire is, what color it is, and how the circuit works. On the Jeep Wrangler 2017, the reverse lights are located in the tail lamp assembly. The wiring runs from the body control module (BCM) to the rear tail lights. The reverse light circuit carries a 12V positive signal when you shift into reverse.
Here’s a simple comparison of wire colors for reverse lights in different Jeep Wrangler models:
| Model Year | Reverse Light Wire Color | Location |
|---|---|---|
| 2015 | White/Gray | Tail light harness |
| 2017 | White/Yellow | Tail light harness |
| 2018 | White/Orange | Tail light harness |
For the 2017 model, you are looking for the white/yellow wire in the tail light harness.
Tools And Materials Needed
To tap into the reverse light, you’ll need a few basic tools. Here’s a quick table comparing popular tapping methods:
| Method | Tools Needed | Pros | Cons |
|---|---|---|---|
| Wire tap connectors | Wire tap, pliers | Easy, no cutting | Can loosen over time |
| Soldering | Soldering iron, solder | Strong, reliable | More skill needed |
| Crimp connectors | Crimp tool, connectors | Quick, neat | May fail if crimped wrong |
Most beginners use wire tap connectors because they are fast and require less skill. If you want a permanent connection, soldering is best.
Here’s a list of recommended tools:
- Wire tap connector or crimp connector
- Wire stripper
- Pliers
- Multimeter (for testing)
- Electrical tape or heat shrink tubing
- Zip ties (for securing wires)
- Flashlight (for seeing inside tail light housing)
Locating The Reverse Light Wire
Finding the right wire is the most important step. Here’s how you do it:
- Open your Jeep’s tailgate and remove the tail light assembly on the side you want to tap.
- Look for the tail light harness – this is a bundle of wires running into the back of the tail light.
- Find the white/yellow wire in the harness. This is the reverse light wire for Jeep Wrangler 2017.
- If you are not sure, use a multimeter to check. Put the Jeep in reverse (with the parking brake on), and test for 12V at the wire.
Be careful: Some wires look similar. Always double-check before tapping.
Step-by-step Guide: Tapping Into Reverse Light
Let’s break down the process into clear steps. This is the safe, beginner-friendly way to tap into the reverse light on Jeep Wrangler 2017.
Step 1: Prepare Your Workspace
Put your Jeep in park, turn off the engine, and set the parking brake. Make sure you have enough light and space.
Remove the tail light assembly with a screwdriver. Place the screws in a safe spot so you don’t lose them.
Step 2: Identify The Reverse Light Wire
Find the white/yellow wire in the tail light harness. Use a multimeter to confirm it has 12V when the Jeep is in reverse. If you don’t have a multimeter, you can use a test light, but a multimeter gives clearer results.
Step 3: Tap The Wire
Depending on your method:
- With a wire tap connector: Place the connector over the white/yellow wire and the wire for your accessory. Use pliers to clamp the connector shut. It will pierce the insulation and connect the wires.
- With crimp connectors: Strip a small section of insulation from the white/yellow wire and your accessory wire. Insert both into the connector and crimp firmly.
- With soldering: Strip a small section of insulation. Twist the accessory wire with the reverse wire. Solder the connection and cover with heat shrink tubing.
Step 4: Secure And Protect
Wrap the tapped area with electrical tape or use heat shrink tubing. This keeps moisture and dust out. Use zip ties to hold wires neatly in place. Make sure nothing is loose or hanging.
Step 5: Test Your Connection
Turn on the Jeep, put it in reverse (parking brake on). Your accessory should activate.
If not, check your connection again. Use the multimeter to see if you have 12V at the tap.
Step 6: Reassemble Tail Light
Once you confirm everything works, put the tail light assembly back. Tighten the screws. Clean up your workspace.
Common Mistakes And How To Avoid Them
Many beginners make errors that can cause problems later. Here are some common mistakes:
- Wrong wire: Always double-check the wire color. Mistaking the wire means your accessory won’t work.
- Loose connections: A bad tap can fail over time. Use proper connectors and tools.
- Skipping protection: Uncovered taps can corrode. Always use tape or tubing.
- Overloading circuit: Don’t connect high-power accessories directly to the reverse light wire. Use a relay for anything over 2A.
- Not testing: Test your connection before reassembling everything. It saves time.
Practical Tips For A Reliable Installation
To make your tap last and stay safe:
- Use heat shrink tubing instead of just electrical tape for weatherproofing.
- If you add extra lights, use a relay so you don’t overload the stock wiring.
- Keep wires away from sharp edges and moving parts.
- Use zip ties to tidy up and prevent wires from snagging.
- Label your wires if you plan to add more accessories later.
Here’s a quick table showing relay wiring for adding high-power backup lights:
| Relay Pin | Connection |
|---|---|
| 85 | Ground |
| 86 | Reverse light wire (signal) |
| 87 | Backup light (+) |
| 30 | Battery (+) |
Using a relay protects your Jeep’s wiring and lets you add brighter lights without risk.
Alternative Methods For Tapping Reverse Light
If you don’t want to tap at the tail light, you can also find the reverse signal at the BCM under the dashboard. This method is more advanced but useful if you need the signal inside the cabin.
- Remove the lower dash panel and locate the BCM connector.
- Find the white/yellow wire (same color as tail light).
- Tap using the same methods as above.
This is handy for installing backup cameras or alarms that need the reverse signal up front.
Real-life Example: Adding Backup Lights
Let’s look at a real-world example. Alex wanted to add LED backup lights to his Jeep Wrangler 2017. He used the tail light method:
- He removed the right tail light assembly.
- Found the white/yellow wire.
- Used a wire tap connector to connect the LED light’s trigger wire.
- Ran power from the battery to the LED lights, using a relay for safety.
- Tested the setup: The LED lights came on only in reverse.
This setup made parking at night much easier. Alex used heat shrink tubing to keep the connection dry and zip ties to secure wires.
He avoided the common mistake of overloading the reverse light circuit by using a relay.
Safety Precautions
When working with car wiring, always follow these safety tips:
- Disconnect the battery if you plan to cut or solder wires.
- Never work under the Jeep while it’s running or in gear.
- Use insulated tools to prevent shorts.
- If you are not confident, ask a friend or a professional for help.
Troubleshooting Tips
If your accessory doesn’t work after tapping the reverse light:
- Check the tap: Is the connector fully closed or soldered well?
- Use a multimeter to confirm 12V at the tap when in reverse.
- Make sure your accessory is grounded properly.
- If using a relay, check the wiring and the relay itself.
- Inspect for blown fuses (especially if adding high-power lights).
Most issues are caused by a bad connection or using the wrong wire.
Frequently Asked Questions
How Do I Know Which Wire Is The Reverse Light On Jeep Wrangler 2017?
The reverse light wire is usually white/yellow in the tail light harness. Always use a multimeter to confirm it gives 12V only when the Jeep is in reverse.
Can I Tap Into The Reverse Light Without Cutting Wires?
Yes. You can use wire tap connectors or crimp connectors that attach without cutting. These tools pierce the insulation and connect your accessory wire easily.
Is It Safe To Connect High-power Lights Directly To The Reverse Light Wire?
No. The stock reverse light circuit is designed for low power. If you add high-power lights, use a relay to protect your Jeep’s wiring and avoid blowing fuses.
Will Tapping Into The Reverse Light Void My Warranty?
Usually, simple taps do not void warranty, but major electrical changes can. Always check your Jeep’s warranty terms or ask your dealer before starting.
Where Can I Find Official Wiring Diagrams For Jeep Wrangler 2017?
You can find wiring diagrams on Jeep forums, in the official service manual, or at Jeep’s official site. These resources show wire colors and locations.
Adding accessories to your Jeep Wrangler 2017 is easier when you know how to tap into the reverse light safely. By following these steps, using the right tools, and avoiding common mistakes, you’ll get a reliable connection for your mods.
Take your time, double-check your work, and don’t be afraid to ask for help if you need it. With careful planning, your Jeep will be safer and more functional every time you back up.
