Blinking lights on dash and exterior lights may indicate a bad ground wire or a faulty headlight switch. Both would cause those problems.
On a 1999 GEO Tracker, a bad fuse can cause the headlights and dash lights to blink. A bad voltage regulator or alternator can also cause lights to blink and flicker.
bad headlight switch.
If it is anything like my '88, it is probably a relay. If you have stock fog lights, try turning them off and see if this helps. On mine, if I turn the fog lights off when the headlights start to blink it fixes the problem...untill i turn the fog lights back on that is. there was a recall to correct this-contact your dealer-they repaired mine for free because of the recall.
If you mean the headlight switch, pulling it out once turns on the dash lights and turns off the daytime running lights, pulling it again turns on the headlights.
I would first check all fuses. My 2002 uses a weird configuration and requires several fuses to work all of the lights properly.
Possible ground issue at the taillights.
My sons 93 royal 88 Oldsmobile right directional would not blink. We changed the bulb and it started to flash.. hope that helps
its on the left turn signal switch, at the end is the headlights, then one in is the fog lights, you twist it just like you would the headlights
the dash and radio lights are supposed to dim when the headlights come on. Make sure you have the brightness of the dash lights turned up as much as possible.
A bad ground wire will cause dim headlights, or will cause lights not to work.
probably the fuse is blown.
I would replace the headlight switch as Ford has had their share of these problems.