Fuse location for relayed headlight harness

[Henry A Harper III]

If the purpose of the fuse is to protect the maximum amount of wiring
harness (and other parts of the car) possible from any short circuits due to
mechanical wiring faults, it makes sense to locate the fuse as close as
possible to the power source. If the fuse were right at the designed ground
point of the circuit it wouldn't blow if a powered wire upstream were to
contact another ground - the current would go through the short until
something melted. You want the fuse to blow instead of other wiring melting
:)

> I'm getting ready to fab up a relayed headlight harness and now I
> am wondering where the fuse should really go. I've made them
> before and always put the fuses between the relay and the power
> source. Why do we do that rather than put the fuse between the
> relay and the headlamp? Input appreciated and TIA