Abstract: An apparatus is provided for electrophoretically depositing paint upon a cathodic substrate, e.g., a truck body, comprising a tank having introductory and exit regions, with a coating region positioned therebetween. The coating region comprises two or more primary anode banks of different electrical potential, the potential of the banks nearer the exit region being successively greater than those of preceding banks. An auxiliary anode bank is positioned between primary banks of different potential, the auxiliary bank being maintained at approximately the same electrical potential as the adjacent lower potential primary bank. Diodes are provided to prevent current flow between lower potential primary anodes, and between auxiliary anodes, through conductor means electrically coupling the anodes together. The subject apparatus reduces current flow from a higher potential bank to a lower potential bank, thus reducing paint deposition upon and subsequent fouling of the anodes of the latter.