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Old 07-07-2012, 08:09 PM
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Philscbx Philscbx is offline
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Join Date: May 2011
Boat: 78 S&S, 04 Pro 209
Location: Mn, Minnetonka
Posts: 276
That's great is finally solved.

High load devices need relays using full battery power / triggered by small wire & load switches at long distance.
Picture the main battery & switches sitting next to pump.
If switches can handle the load of the pumps - fine.

But that's not the case - switches have very low load ability in that amp range.
They would get hot & melt.
You could use phone cable as the trigger voltage to the relays & relays would have the 10G wire to run the pumps.
Of course - the relay's main power source would also need 10G wire from battery.

Similar to key switch to starter - it can be any distance from starter - it's just the trigger voltage going there.
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