Relays and fuses, what goes where?

[andyborris]

Tidying up the spaghetti I call wiring!

Have relays on headlights and horn, the type with a fuse mounted in it.

Want to move the relays out of sight, so will need to use separate fuses, because the fuses will no longer be easily accessible.

Should the relay have it's fuse in the +feed to the light (or horn) from the relay, or in the + feed to the relay, or doesn't it matter?!

And the electric fan blows the fuse with a start up surge, is there such a thing as a slow blow fuse?

Thanks

[steveo3002]

you can do either , depends on what and where youre fitting it all , obviously don't want miles of unfused wire trailing around

[squonk]

It's best to put the fuse in the feed to the relay. If the relay is damaged and internally shorts to earth the wiring to it will not be protected if the fuse is between the relay and whatever it is switching.

[andyborris]

Oct 14, 2014 18:40:04 GMT squonk said:

It's best to put the fuse in the feed to the relay. If the relay is damaged and internally shorts to earth the wiring to it will not be protected if the fuse is between the relay and whatever it is switching.

That makes sense and makes it easier to install!

Thanks

[ejenner]

Have you thought about getting a fuse and relay box off another car? Quite easy to get that sort of thing off an old Saab.

Here's an example of a small one. 3 fuses and 2 relays. You can get bigger ones.