1993 Johnson Evinrude "ET" 40 thru 55 Service Manual, P/N 508283, Page 273Get this manual
Battery Cable Extensions The following are minimum specifications for stranded copper cable without splicesCable measurements given are from the motor to the batteryThe maximum length is 20 ft(6,1 m), regardless of cable diameterThese specifications do not apply to aluminum battery cablesOMC does not recommend the use of aluminum battery cablesMinimum Recommended Gauge
Total Extended Length Model 205010 ft(0,3m) ga 1115 ft(3,44,6 m) gao 1620 ft(4,96,1 m) ga o
PCE0061
Battery Specifications
All batteries should be of heavy duty, marine construction and vented, refillable typeMaintenance-free or sealed batteries are acceptable for use ONLY with engines that are equipped with fully regulated charging systemRefer to Specifications, Section 1Deep-cycle batteries must not be used as the engine's cranking batteryA battery that is not fully charged or is less than recommended capacity may not crank the engine fast enough to produce ignition component outputFor best performance, OMC recommends you use 12-volt battery with inimum rating of 360 cold cranking amps (CCA) at (72 amphrsat -18 C) and 115 minutes reserve capacity at 80 (2]0 C)Battery Testing