DesertBronco
New member
I've found this on several pre-90's Ford's ... either the low or the high beam on one headlight will not come on... bulb is good, exposed wires look good, foot switch is good... before you go pulling apart every harness and chasing too many wires ... it's somewhat common for the wire joint in the left front corner wire bundle (just in front and below of the washer fluid/coolant overflow tank) to come undone. This connection is internal to the plastic protective sleeve/electrical tape of the wire bundle in that area. Very simple repair. Unhook the battery, and unplug the connection on the back of both headlight filaments (to avoid possible damage to them while soldering). Undo the bolt(s) holding the fuild reservoir in place and unplug the low washer fluid electrical connection (any fluid in the tank will not come out). Undo the plastic sleeve/electrical tape, and find the red wire with a 'faint' black streak on it. There should be 3 red wires of different gauges. It will most likely have a second wire joined in with it from the rt headlight. You can find the right one by pulling gently on the wire from the rt headlight connector to see which on the left side moves. Repair with a simple soldering, retape and reassemble the removed/unhooked parts. If that doesn't work, the second most problem is usually the hi/lo beam foot switch in the floor of the driver's side. While you have the two headlight connectors unplugged, it's a good time to put some silicone **** on them to keep out dust and corrosion as well. Enjoy!