Cat Conversion Harnesses - MAWK INDUSTRIES: CAT CAT ADAPTERS . Cat Conversion Harnesses $775 to $875 for most trucks 10 feet long. These harnesses are used to replace mechanical engines with electronic engines. Each wire is colored coded with eleven colors to match the Caterpillar wiring schematic. Each wire is printed every six inches identifying what circuit it is such as Check Changing inside wire harness in 2006 Cat C15 Acerrt (MXS Mar 16, 2013Changing inside wire harness in 2006 Cat C15 Acerrt (MXS) Discussion in 'Peterbilt Forum' started by paul_k, Mar 16, 2013. Page 1 of 2 1 2 Next > Mar 16, 2013 #1. paul_k Bobtail Member. 13 2. Apr 1, 2012 Chicago,Illinois 0.