why a Relay?

[phil on a fazer]

Relays can be used for various purposes: in this case it's providing a shorter, lower resistance path for the current to get to your accessories. It also has the benefit that it reduces the current that the ignition switch (and anything else in the switched live supply) has to handle.

I think the additional "relay" in your drawing is just a switch so you can turn off the driving lights independently,

Yeah i think your right about the driving lights, think thats you so you can have them switchable.

i always thought Relays boosted Current??  :o  thats why you have starter relays and fuel relays. These things need a larger current, so smaller current is sent from the battery to the relay that then boosts it to turn / work the starter motor or fuel pump???

I guess thats why i need a relay between the switched live from the main Fusebox to the 2nd fusebox - it helps to boost the current???

cheers