CDI Electronics 413-1721 Wiring Harness - Replaces OMC 581721 - Fits 1977 85/115/140 HP Johnson Evinrude Cross Flow Round Plug Outboards

The CDI Electronics 413-1721 is a wiring harness engineered for Johnson and Evinrude outboard engines equipped with round plug, cross flow powerheads. CDI Electronics builds ignition and diagnostic components for the marine industry, and this harness is designed as a cost-effective alternative to the original OEM-supplied wiring, delivering the same fit and function without the OEM price tag. The harness uses copper conductors for reliable current and signal transfer between the engine's ignition components, and terminates in a round plug connector to match the factory connection points on compatible engines.

This harness is built specifically for 1977 model year Johnson and Evinrude outboards rated at 85 HP, 115 HP, and 140 HP with cross flow, round plug configurations. It is a direct replacement for the OMC part number 581721, allowing owners to restore or repair the engine wiring harness without sourcing a discontinued OEM part. Installation follows the routing and connection points of the original factory harness.

Specifications

• Brand: CDI Electronics
• Manufacturer Part Number: 413-1721
• Material: Copper
• Connector Type: Round Plug
• Weight: 0.8 pounds
• UPC: 736983853691
• Engine Configuration: Cross Flow Engines, Round Plug

Fitment

• Johnson/Evinrude 85 HP - 1977
• Johnson/Evinrude 115 HP - 1977
• Johnson/Evinrude 140 HP - 1977
• Cross Flow Engines, Round Plug configuration

Replaces (OEM)

• OMC 581721

Frequently Asked Questions

What engines does the CDI Electronics 413-1721 wiring harness fit? The 413-1721 fits 1977 Johnson and Evinrude outboards rated at 85 HP, 115 HP, and 140 HP with cross flow, round plug engine configurations.

What OEM part number does the 413-1721 replace? It replaces OMC part number 581721, so it can be used as a direct swap for that original wiring harness.

Is this harness genuine OEM or aftermarket? The 413-1721 is manufactured by CDI Electronics as an aftermarket component built as a cost-effective alternative to OEM-supplied wiring harnesses, not an original OMC part.

What material is the wiring made from? The CDI Electronics 413-1721 harness uses copper conductors for the internal wiring.

What type of connector does the 413-1721 use? It uses a round plug connector, matching the factory connection style found on the 1977 Johnson/Evinrude cross flow engines it is designed for.

How much does the 413-1721 wiring harness weigh? The harness weighs 0.8 pounds.

Will this harness work on a 1978 or later Evinrude outboard? The 413-1721 is specified for 1977 model year 85 HP, 115 HP, and 140 HP Johnson/Evinrude engines; fitment for other model years is not specified for this part number.

Does the 413-1721 fit both 85 HP and 115 HP engines? Yes, the CDI Electronics 413-1721 is fitted to 1977 Johnson/Evinrude 85 HP, 115 HP, and 140 HP cross flow, round plug engines.

What is included with the CDI Electronics 413-1721? The 413-1721 is supplied as a single wiring harness unit designed for direct installation on compatible 1977 Johnson/Evinrude engines.

How is CDI Electronics different from the original equipment manufacturer? CDI Electronics builds ignition and wiring components, including the 413-1721 harness, engineered to match OEM fit and performance while offering a cost-effective alternative to OEM-supplied parts.