wire

Just put together my draft of a solar and battery system. I chose wires size for max loads on each panel. Any glaring problems?

I have a 1991 Hunter 35.5 and I am looking to run wires from the battery storage area to the switch pannel/steareo. I can't figure out how they are currently ran even after looking at the wiring diagram. Any help on how to access wires in order to run some more would be much appreciated.

Anyone know what this is in my O’Day 26? The bolts are coming straight up through the hull under the starboard forward settee. The yellow wire is heavy gauge and is disconnected at the other end, but looks like it was connected to the negative bus. I bought the boat two years ago, and just...

Had a high resistance ground, from ignition switch to Alternator controller, towed to Saint Augustine replaced switch and wire. But have to replace wiring, have a 1.5 v leakage in damage somewhere. Looking for good supplier for all the colors.