1. Introduction
This instruction manual provides detailed guidance for the installation and use of the TOMALL H11/H8 to Deutsch DT/DTP 2-Pin Wiring Harness Adapter. This product is designed to facilitate the connection of H11 or H8 compatible light bulbs to devices utilizing Deutsch DT or DTP 2-pin connectors, commonly found in work lights and light bars. Please read this manual thoroughly before installation to ensure proper function and safety.
2. Product Overview
The TOMALL H11/H8 to Deutsch DT/DTP adapter provides a convenient plug-and-play solution for converting H11/H8 connections to Deutsch DT/DTP 2-pin connections. It is constructed from durable ABS, copper wire, and plastic pipe materials, designed for reliability in various automotive and industrial applications. The harness is rated for power up to 700W and features an IP68 dustproof rating, ensuring performance in challenging environments.

Figure 2.1: Overview of the TOMALL H11/H8 to Deutsch DT/DTP 2-Pin Wiring Harness Adapters. The image displays two complete adapter harnesses, along with close-up views of both the H11/H8 male connector and the Deutsch DT/DTP female connector, highlighting their design and connection points.
3. Safety Information
- Always disconnect the vehicle's battery before performing any electrical work to prevent short circuits or electrical shock.
- Ensure the power rating of the connected light or device does not exceed the adapter's maximum capacity of 700W.
- Verify all connections are secure and properly seated to prevent loose contacts and potential hazards.
- If you are unsure about any step of the installation process, consult a qualified automotive electrician.
- Do not modify the wiring harness. Unauthorized modifications can lead to malfunction, damage, or fire.
4. Package Contents
Each package contains the following items:
- 2 x TOMALL H11/H8 to Deutsch DT/DTP 2-Pin Wiring Harness Adapters
- Note: Lights or other devices are not included.
5. Specifications
| Feature | Specification |
|---|---|
| Model | H11/H8 to Deutsch DT/DTP 2-Pin Adapter |
| Material | ABS, Copper Wire, Plastic Pipe |
| Connector Type | H11/H8 (male) to Deutsch DT/DTP 2-Pin (female) |
| Maximum Power | Up to 700W |
| Protection Rating | IP68 Dustproof |
| Total Length | 21.5 cm (8.5 inches) |
| Extend Part Length | 14 cm (5.5 inches) |
| Weight (per pair) | 42g (1.41 ounces) |

Figure 5.1: The wiring harness adapter with indicated total length of 21.5 cm (8.5 inches) and an extend part length of 14 cm (5.5 inches).
6. Setup and Installation
The TOMALL wiring harness adapter is designed for plug-and-play installation. Follow these steps for a secure connection:
- Prepare for Installation: Ensure the vehicle's power is off and the battery is disconnected to prevent electrical issues.
- Identify Connectors: Locate the H11 or H8 connector on your vehicle's existing wiring and the Deutsch DT/DTP 2-pin connector on your light bar or work light.
- Connect H11/H8: Plug the H11/H8 male connector of the adapter into the corresponding H11/H8 female connector on your vehicle's wiring. Ensure it clicks securely into place.

Figure 6.1: Detailed view of the H11/H8 male connector end of the adapter, showing its two pins and housing designed for compatibility with H11/H8 sockets.
- Connect Deutsch DT/DTP: Plug the Deutsch DT/DTP 2-pin female connector of the adapter into the corresponding male connector on your light bar or work light. Ensure the connection is firm and the locking tab engages.

Figure 6.2: Detailed view of the Deutsch DT/DTP 2-pin female connector end of the adapter, featuring the green seal and 'B' marking, indicating its design for secure, weather-resistant connections.

Figure 6.3: Another close-up of the Deutsch DT/DTP connector, showing the "DEUTSCH IPD USA DT06-2S" label, confirming its type and manufacturer for robust applications.
- Secure Wiring: Route the wiring harness safely, away from moving parts, sharp edges, or excessive heat sources. Use zip ties or clips if necessary to secure it.
- Reconnect Power: Once all connections are made and secured, reconnect the vehicle's battery.
- Test Functionality: Turn on your vehicle's lights to verify that the connected light bar or work light functions correctly.
Important Note on Polarity:
In rare cases, some aftermarket lights may have a reversed polarity compared to the standard H11/H8 wiring. If your light does not function after installation, the polarity of the Deutsch connector might need to be reversed. This can often be done by carefully releasing the pins from the Deutsch connector housing and swapping their positions. If you encounter this issue and are not comfortable performing this modification, please consult a professional or contact customer support.
7. Operating Instructions
Once installed, the TOMALL H11/H8 to Deutsch DT/DTP adapter operates passively. The connected light or device will function according to its own operational controls, utilizing the power supplied through this adapter from the H11/H8 source. No additional operational steps are required for the adapter itself.
8. Maintenance
The TOMALL wiring harness adapter requires minimal maintenance. To ensure longevity and reliable performance:
- Periodically inspect the connectors for any signs of corrosion, damage, or loose connections.
- Keep the connectors clean and free from dirt or debris. A soft, dry cloth can be used for cleaning.
- Avoid exposing the harness to extreme physical stress or sharp objects that could damage the insulation or wires.
- The IP68 rating provides protection against dust and water immersion; however, avoid prolonged submersion or high-pressure water jets directly on the connectors.
9. Troubleshooting
Issue: Light does not turn on after installation.
- Check Connections: Ensure both the H11/H8 and Deutsch DT/DTP connectors are fully seated and locked.
- Verify Power Source: Confirm that the H11/H8 power source is active and providing power. Test with a multimeter if possible.
- Inspect Light: Ensure the light bar or work light itself is functional by testing it with a known good power source.
- Check Polarity: As mentioned in Section 6, some aftermarket lights may require a polarity reversal. If all other checks fail, carefully inspect the wiring polarity at the Deutsch connector. If the light still does not work, try reversing the wires within the Deutsch connector (consult a professional if unsure).
- Inspect for Damage: Look for any visible damage to the wiring harness, such as cuts, pin bends, or corrosion.
Issue: Intermittent light operation.
- Secure Connections: Ensure all connections are tight and not vibrating loose.
- Check for Fraying/Damage: Inspect the wiring for any signs of wear, fraying, or partial breaks that could cause intermittent contact.
10. Warranty and Support
For warranty information or technical support regarding your TOMALL H11/H8 to Deutsch DT/DTP 2-Pin Wiring Harness Adapter, please refer to the product packaging or contact TOMALL customer service directly. Contact details can typically be found on the manufacturer's official website or through your point of purchase.