CDI Electronics 123-7566 Johnson Evinrude Shift Assist - OMC Sterndrive ESA Delco Distributor Resistor

The CDI Electronics 123-7566 is a Johnson Evinrude Shift Assist component built for OMC Sterndrive Electronic Shift Assist (ESA) systems that use a Delco Distributor. It functions as a 2.5 Ohm, 50 Watt resistor and is used together with Shift Assist modules as part of the ESA circuit, helping the system manage shift timing and load during gear engagement. This is a direct-fit replacement designed to restore proper function to an OMC Sterndrive shift assist setup without modifying the original wiring or module configuration.

Built to CDI Electronics standards, this shift assist resistor is a straightforward swap for the OEM component it replaces, making it a practical choice for owners repairing or servicing an OMC Sterndrive Delco Distributor ESA system. At 0.5 pounds, it is a compact, lightweight electrical component intended for installation alongside the existing Shift Assist module wiring.

Specifications

• Brand: CDI Electronics
• Manufacturer Part Number: 123-7566
• Product Name: Johnson Evinrude Shift Assist - Delco
• Application: OMC Sterndrive Electronic Shift Assist (ESA), Delco Distributor
• Resistance: 2.5 Ohm
• Power Rating: 50 Watt
• Used With: Shift Assist Modules
• Weight: 0.5 pounds

Fitment

• OMC Sterndrive systems using Electronic Shift Assist (ESA) with a Delco Distributor and Shift Assist Modules

Replaces (OEM)

• 121-BR50-2.5

Frequently Asked Questions

What is the CDI Electronics 123-7566 used for? It is a shift assist resistor for OMC Sterndrive Electronic Shift Assist (ESA) systems that use a Delco Distributor, and it is used together with Shift Assist modules to complete the ESA circuit.

What is the resistance and power rating of part 123-7566? The CDI Electronics 123-7566 is rated at 2.5 Ohm resistance and 50 Watt power.

Does 123-7566 replace an OEM number? Yes, this shift assist component replaces OEM part number 121-BR50-2.5.

Is this an OEM or aftermarket part? The 123-7566 is a CDI Electronics part manufactured as a direct replacement for the OEM 121-BR50-2.5 component in OMC Sterndrive ESA systems.

Does this part work on its own, or does it need other components? It is used with Shift Assist modules as part of the OMC Sterndrive Electronic Shift Assist (ESA) system; it is not a standalone shifting device.

What system does the CDI 123-7566 belong to? It belongs to the OMC Sterndrive Electronic Shift Assist (ESA) system that uses a Delco Distributor.

How much does the 123-7566 weigh? The CDI Electronics 123-7566 Johnson Evinrude Shift Assist weighs 0.5 pounds.

Is the CDI 123-7566 a switch box or a resistor? It is a 2.5 Ohm, 50 Watt resistor component of the ESA system, not a switch box.

What brand distributor does this shift assist component pair with? The 123-7566 is designed for use with a Delco Distributor in OMC Sterndrive ESA setups.

Can I use part number 121-BR50-2.5 interchangeably with the CDI 123-7566? Yes, the CDI Electronics 123-7566 is the direct replacement for OEM part 121-BR50-2.5.