St4000 - wiring and voltage drop

[Chuck - Raymarine - Moderator]

James,

While your battery(s) may have load tested satisfactorily, the problem appears to be one of insufficient power to the entire system. Contributing factors may include insufficient battery capacity, corroded conductors, posts, or connector, loose connections at battery, bus bar, and panel. As these are easy items to check, these should be examined first. Adding additional battery storage should also be considered ... recommend changing all batteries whenever adding or replacing a battery. A

s the autopilot is not reporting any problem with the drive (i.e. Drive Stopped) and is not blowing any fuses, the reported browning out is resulting from not having electrically isolated the marine electronics from the vessels other systems and placing a higher power demand on the supply circuit than can be accommodated.