Return (ground) to is common to the switch so if lose, corroded it will impede starting. A bad connection gets hot real fast causing an increase in resistance and reduces current flow.
Check ground connection to block.
Other common points are the slave and starter soleniod which can develop pitted contacts over time but I would not expect the helm power to drop off with these.
With dual engines you can swap part between them if you suspect anything else to test before replacing.
IMO start with the ground.
BTY if one battery is bad and the switch is set to both the bad one will drag the good one down so using the both position doesn't always work however switch to batt 2 should if batt 1 is bad.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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