@ ways you can go about it. Check the wattage of all loads in the circuit, and then apply the following formula. ( P = I E )
Where P is power ( wattage ), I is current ( an unknown that you will be solving for ) and E for voltage. Don't use 12v.. use normal charge voltage. After starting your tractor, and letting it run and recharge the battery from the start, take a couple of voltage readings.. use the average of these voltages.Yor formula will actually be ( P / E = I ) That is, total power, divided by the Voltage, equals current flow inthe circuit. That will show you calculated current. Size your fuse from there. Choose the closest size up. You may want to use a slow-blow. Minimal extra cost. Or, you can hook the circuit up un-fused, and check it with an ammeter. Clamp on is ok, shunt style is better. You will probably be safe enough calculating it.
Give yourself a little headroom on the wattage number, as it is probably an assemblyline approximation.. much like a resistor ( resistors have a tolerance, denoted by a color band... the resistance can vary by the percentage indicated on the band.. some as much as 20% ). Soundguy
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