Diagram of Honda OBD1 to OBD2 Alternator Wiring

Many Honda owners consider converting their OBD1 alternator to the newer, more efficient OBD2 alternator. However, a lot of confusion surrounds the wiring process for this conversion. In this article, we will provide a comprehensive guide on how to wire your Honda alternator correctly.

What is OBD?

OBD or On-Board Diagnostics is a computer system that helps diagnose and troubleshoot vehicle problems. This system was first introduced in the 1970s and has since evolved with newer technologies.

OBD1 and OBD2 refer to two different generations of diagnostic systems. OBD1 was introduced in the early 1980s and was used until 1995, while OBD2 was implemented in 1996 and has been in use since then.

Why Convert to an OBD2 Alternator?

The main reason why Honda owners convert from an OBD1 alternator to an OBD2 alternator is efficiency. The OBD2 alternator has a higher output and is more efficient than the OBD1 alternator. Additionally, the OBD2 alternator can support higher electrical loads, making it a better choice for modified or heavily equipped vehicles.

Diagram of Honda OBD1 to OBD2 Alternator Wiring

When converting from an OBD1 alternator to an OBD2 alternator, you will need to wire the alternator correctly to ensure it works seamlessly with your vehicle’s system. Below is a diagram of the wiring process:

Honda OBD1 Alternator Honda OBD2 Alternator
Battery Positive Battery Positive
Yellow/Black Yellow/Black
White/Black White/Black
Green/White Green/White
Black/Yellow Black/Yellow
Blue/White Blue/White

Battery Positive

The battery positive cable should be connected to the positive terminal of the battery.

Yellow/Black Wire

The yellow/black wire on the OBD1 alternator should be connected to the yellow/black wire on the OBD2 alternator. This wire is responsible for the alternator’s charging signal.

However, in some cases, the yellow/black wire may be connected to the battery light on the dashboard. In this case, you will need to run a jumper wire from the yellow/black wire to the previously mentioned wire on the OBD2 alternator.

White/Black Wire

The white/black wire on the OBD1 alternator should be connected to the white/black wire on the OBD2 alternator. This wire is responsible for the alternator’s voltage sensing.

Green/White Wire

The green/white wire on the OBD1 alternator should be connected to the green/white wire on the OBD2 alternator. This wire is responsible for the alternator’s field signal.

Black/Yellow Wire

The black/yellow wire on the OBD1 alternator should be connected to the black/yellow wire on the OBD2 alternator. This wire is responsible for the alternator’s ground.

Blue/White Wire

The blue/white wire on the OBD1 alternator should be connected to the blue/white wire on the OBD2 alternator. This wire is responsible for the alternator’s light output signal.

FAQs

Q: Can I use an OBD2 alternator on my OBD1 Honda?

A: Yes, you can, but you will need to wire the alternator correctly. Refer to the diagram above for guidance.

Q: Is it necessary to convert from an OBD1 alternator to an OBD2 alternator?

A: No, it is not necessary, but it is recommended. The OBD2 alternator is more efficient and can handle higher electrical loads, making it a better choice for modified or heavily equipped vehicles.

Q: What is the difference between an OBD1 and an OBD2 alternator?

A: The main difference is efficiency. The OBD2 alternator has a higher output and is more efficient than the OBD1 alternator. Additionally, the OBD2 alternator can support higher electrical loads.

Q: Will converting to an OBD2 alternator improve my vehicle’s performance?

A: No, it will not directly improve your vehicle’s performance. However, it can ensure your electrical system is running efficiently and can handle increased electrical loads if you have modified or heavily equipped your vehicle.

We hope this article has been helpful in providing a comprehensive guide on how to wire your Honda alternator when converting from OBD1 to OBD2. If you have any further questions, do not hesitate to ask a professional mechanic or refer to your vehicle’s manual.