FAQ: Engine Harness Upgrade 

C34s built prior to the 1993 model year run the charging wire from the alternator all the way to the control panel, and then back to the battery, resulting in significant voltage loss. In addition, the control panel wiring employed rubber plugs in the harness, and these plugs are highly vulnerable to corrosion in the marine environment. The upgrade kit, available from Seaward Products, routes the charging cable from the alternator directly to the battery, and substitutes marine-approved terminal strips in place of the vulnerable rubber plugs. If you have a 1992 or earlier C34, the upgrade is very strongly recommended.

Important: The opinions expressed here are those of the individual contributors to this page, and not those of the Catalina 34 National Association or Catalina Yachts, Inc. Additionally, this material has not been reviewed by Catalina Yachts, Inc. for technical accuracy. This page's maintainer cannot guarantee the accuracy of this information or the desirability of suggested modifications or upgrades. Please obtain assistance from a competent marine mechanic or boatyard prior to making any significant modifications to your vessel.