I'm not sure I understand because your alternator wire should go to your battery (or starter sol +12 post). It is already constant power.
As far as relay draw, the relay coil is only on with the headlight switch (in this case). Contacts don't pass power until the headlight switch is pulled.
Overcurrent protection is there for the wires or contacts, which ever has the lowest rating. Ex: if your wire is small like #18, it safely passes 10 amps continuously. So a short on this wire should blow a 10-amp fuse without damaging the wire. Hopefully, the relay contacts are rated for 10 amps as well. - Dave
As far as relay draw, the relay coil is only on with the headlight switch (in this case). Contacts don't pass power until the headlight switch is pulled.
Overcurrent protection is there for the wires or contacts, which ever has the lowest rating. Ex: if your wire is small like #18, it safely passes 10 amps continuously. So a short on this wire should blow a 10-amp fuse without damaging the wire. Hopefully, the relay contacts are rated for 10 amps as well. - Dave
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