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As designed by Honda, the cable from the main fuse box to the starter motor is part of the long cable from the main fuse box to the battery.   Its part # is 32410 SL0 A02.   As I recall, the long 'battery' cable and the shorter 'starter' cable are both crimped to a plate and the plate is bolted to the jump start terminal in the main fuse box.   You should do a visual check; but, that is my recollection when I investigated my battery clamp replacement exercise long ago.


You might be able to hacksaw that joining plate in half and just fabricate a new cable to the starter with appropriate lugs for connection at the fuse box and the starter motor.   Take the old cable to a good auto electric specialist and they should be able to fabricate it for you.   After hacksawing the joiner plate in half, you would need to make sure that the connection at the jump start terminal makes a satisfactory connection between the battery cable and the starter cable - you need to figure that bit out!


With respect to the green stuff on the cable,  its likely a copper oxide (actually a carbonate I think).   Unlike rust on iron / steel, copper oxides usually just stay on the surface and the base copper stays OK so the cable may be just fine.   You could clean the terminal by dipping in vinegar which should remove the tarnish and allow you to check the copper for damage.   For the copper to form an oxide like that, it has to be exposed to sustained moisture or really high humidity (I suppose Miami could do that).  If you are obsessive about washing the engine compartment - don't.   If you clean up the terminals, apply a section of double wall  heat shrink on the gap between the cable jacket and the crimped lug to protect the copper from further oxidation.   Covering the lugs with a light  coat of grease will prevent oxidation of the those terminals.    You can use a compound like No Ox on the exposed lugs /terminals to prevent corrosion of those terminals.


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