MSD 6420 Wiring Diagram: A Comprehensive Guide

The MSD 6420 is a popular ignition control module used in high-performance engines. It is designed to provide precise timing control and increase engine power output. However, installing and wiring the MSD 6420 can be a challenging task, especially for beginners. In this article, we will provide an in-depth guide on how to wire the MSD 6420 and help you get the most out of your engine’s performance.

What is an MSD 6420?

The MSD 6420 is a digital 6AL ignition control module designed for use in high-performance applications. It is a programmable device that can be customized to suit different engine configurations. The MSD 6420 provides precise timing control and multiple spark discharge that can increase engine performance and improve fuel efficiency. It has a rev limiter that can be set according to your engine’s redline RPM, and a start retard that can help to improve cold-start performance.

How to Wire an MSD 6420?

The MSD 6420 wiring diagram can be overwhelming for beginners, but it’s not as difficult as it seems. Here’s a step-by-step guide on how to wire the MSD 6420:

Step 1: Disconnect the Battery

Before you start wiring the MSD 6420, it’s essential to disconnect the battery to avoid any electrical shock or damage to the module. Remove the negative cable from the battery and secure it away from any metal surfaces.

Step 2: Mount the MSD 6420

Mount the MSD 6420 in a dry and cool location away from any heat sources or moving parts. Use the supplied mounting screws or brackets to secure the module in place.

Step 3: Connect the Wiring Harness

Connect the wiring harness to the MSD 6420 following the wiring diagram. Make sure that each wire is securely fastened and properly routed to avoid any contact with moving parts or heat sources. Use zip ties or clamps to secure the wiring harness in place.

Step 4: Connect the Battery Wires

Connect the positive wire from the battery to the red wire on the MSD 6420, and the negative wire to the black wire on the module. Make sure that each wire is properly crimped and connected to avoid any electrical short circuits.

Step 5: Connect the Ignition Wires

Connect the ignition wires to the corresponding terminals on the MSD 6420. The wiring diagram will show you which wire goes to which terminal. Make sure that each wire is securely fastened and properly routed to avoid any contact with heat sources or moving parts.

Step 6: Set Up the MSD 6420

Set up the MSD 6420 according to your engine configuration. This includes setting the rev limiter, start retard, timing curve, and other parameters. Refer to the instruction manual for detailed instructions on how to program the MSD 6420.

FAQs

What is the maximum RPM that the MSD 6420 can handle?

The MSD 6420 can handle up to 15,000 RPM. However, it’s essential to set the rev limiter to a safe RPM range that matches the capabilities of your engine.

Can I use the MSD 6420 with a carbureted engine?

Yes, the MSD 6420 can be used with a carbureted engine. It provides precise timing control and multiple spark discharge that can improve engine performance and throttle response.

What type of spark plugs should I use with the MSD 6420?

The MSD 6420 is compatible with most types of spark plugs, including copper, platinum, and iridium. However, it’s essential to use spark plugs that are recommended for your engine to ensure optimal performance and longevity.

Can I use the MSD 6420 with other MSD ignition products?

Yes, the MSD 6420 is compatible with other MSD ignition products, including distributors, coils, and spark plug wires. However, it’s essential to follow the wiring diagram and instructions carefully to avoid any electrical short circuits or damage to the modules.

How do I troubleshoot the MSD 6420?

If you experience any issues with the MSD 6420, refer to the troubleshooting section in the instruction manual. Check the wiring connections, fuses, and battery voltage to ensure that everything is properly connected and functioning. If the issue persists, contact MSD support for further assistance.

Conclusion

The MSD 6420 is a powerful ignition control module that can improve engine performance and throttle response. Wiring the MSD 6420 can be a challenging task, but with this guide, you should be able to wire it correctly and set it up according to your engine configuration. Remember to follow the wiring diagram and instructions carefully and consult the FAQ section if you have any questions or issues.