Reply To: 1969 Mercury 350 (35hp) – Charging circuit and lithium ion battery issues

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March 21, 2022 at 1:25 pm #256581
ChrisAF
Participant

    Thanks! That is the same diagram I found in my manual. I posted that in the other forum (linked in my OP) yet others responding there refused to believe it didnt have a charging circuit.

    So, it must be the induced voltage in the primary power cables that is tripping the battery to shut off. I did in fact measure a voltage there, so I know it exists (although very small at 0.2V AC. )

    I’ll go ahead with my plan to install a cutoff switch.

    Also, I know it is not the current draw from the starter that is shutting down the battery. Battery has a peak continuous discharge of 100A and 500A for 3 seconds. I also confirmed this by calling the manufacturer. Also, the battery never shutoff when starting, it only did so when idling around at 3mph (many minutes after starting). If it were the current draw from starting, the battery would switch off immediately.