Bright Headlights? Add Relays

The Problem:

The stock wire headlight wiring is quite small (#18)
and it follows a serpentine-like path from the battery to the
headlight switch, down to the high/low switch and then back thru the
engine compartment to the headlights. The voltage drop along this
path is not negligible, so the lights only get maybe
9-12 volts instead of the 13-14 they should have.
You also can get flickering from the headlight thermal breaker tripping,
which eventually dies from the well known "flashing Ford headlights" syndrome.

Brighter Headlights

Here is a quick and easy way to put more light in your path. This is one of the easiest and cheapest modifications you can do to your rig.

Here is an ascii diagram of the modification:

      foot
 in-dash Battery switch
 light switch | o-------------|) high beam
                o-------------------Relay----|-----\
              | |  round        | o-------------|) low beam
              | |
              |____________|

Here are the directions: