John Deere 425 Electrical problem- no power when turning the key

[Lauren]

I have combed over the JD manual. It shows an F1 Fusible link in the schematic just before the starting motor. Does this mean there is supposed to be a fuse there which I can check? Because I cannot find any fuses there, Just wires that join together in a protective jacket. Or when it says, "Fusible link", does that just imply a some type of connection of wires but no fuse there?

 

[Boobala]

I have combed over the JD manual. It shows an F1 Fusible link in the schematic just before the starting motor. Does this mean there is supposed to be a fuse there which I can check? Because I cannot find any fuses there, Just wires that join together in a protective jacket. Or when it says, "Fusible link", does that just imply a some type of connection of wires but no fuse there?

A fusible link has NO fuse, it is a wire in the system that melts or "breaks" the connection if overloaded, as long as it's good, there should be continuity at end to end of the wire (they rarely go out unless of a "spike" or significant overload on the circuit it's protecting,) when bad, it must be cut out and re-sliced with the same type/size wire fusible link, some are even marked as a fusible link.

 

[bertsmobile1]

A fusible link has NO fuse, it is a wire in the system that melts or "breaks" the connection if overloaded, as long as it's good, there should be continuity at end to end of the wire (they rarely go out unless of a "spike" or significant overload on the circuit it's protecting,) when bad, it must be cut out and re-sliced with the same type/size wire fusible link, some are even marked as a fusible link.

Not quite right there Boo.
The fusable link is exactly what it says it is............. A FUSE.
It is nothing more than a length of wire one or two sizes smaller than the rest of the wiring.
IT IS USED TO OVERCOME SPIKES WHICH WOULD USUALLY BLOW A STD FUSE.

Fuses like everything else are rated differently in the USA to the rest of the world.
Thus a 20A Pommie fuse is a 30A USA fuse.

Personally, I replace them with a std breaker which will also handle spikes better than an standard fuse.