Loosing charge on cranking battery

You are experiencing parasitic voltage from the engine, dash and other components. Stereos are the worst drain if you have one and the issue is just keeping all the little processors hot on components that are made today. Since your a farmer, we assume your tractors totally shut off, and a manual banana style terminal spade or master battery switch would end most of this. Some tractors have these installed on newer computerized equipment. The older equipment totally shut down. Boats are not any different as the newer boats have drains, and the older ones you may be able to start after sitting for months, and we have done this after 6 months on older boats.

BCB

The simplest one is those banana spade switches that go on the main positive line. There are other quick disconnects that do the same, though these are simplest. We have seen others add a master power switch solenoid and we also have considered that for our uses. Simply turn on the Master and the solenoid launches the voltage to components, though the amount of terminals required can make this difficult if you are over three (3) wires. Also the charger leads bypass those spade switches and go direct.

BCB

Here is a sample though there are many.

http://order.waytekwire.com/productdeta … ISCONNECT/

http://www.trojanbattery…._batteryguide_201105.pdf