1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 271Get 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,' 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 255510 ft(0,3m) gao 1115 ft(3,44,6 m) gao 1620 ft(4,96,1 m) gao
PCE0061
Battery Specifications
rv For each motor provide one battery that is:
'2-volt, heavy-duty, designated "marine" Ventedrefillable or maintenance-free Rated 360 CCA (465 MCA) with 90 minutes reserve (50 amp-hrs) Deep-cycle batteries are suitable IF they meet or exceed the minimum CCA requirementsInstalling and Connecting Batteries and Cables Place the battery so it is easily accessible for frequent checking and recharging and in hold-down systemInstall positive cable to positive post and negative cable to negative post