You have a ground fault. Check the grounds to the dash and the ABS controller.
There are several possibilities: It could mean a bad switch in the dashboard. It could mean a bad ground or bad connection in the wiring. There are other possibilities but that's where I'd start.
Antilock brake system
most likely daytime running light module is malfunctioning
If you are parked and you want to here the radio without the Automatic headlights on. Some times if you engage the parking brake it will turn off the automatic head lights.
There are several possibilities; headlight switch, headlight breaker or fuse, connectors, dimmer switch.
In a 1993 Ford Aerostar, the fusible link for the headlights is typically located in the engine compartment. It is usually found near the battery, connected to the wiring harness. To identify it, look for a small section of wire that is different in color or size from the surrounding wires, as it may be a thicker gauge wire. Always consult the vehicle's service manual for specific diagrams and details regarding the electrical system.
There is a relay switch for the signal flasher's, on your 1997 Ford van. The relay switch is below the dashboard on the drivers side.
"The fuse box is located just behind the hood latch below the dashboard on the drivers side of the van." That is the correct "Location".
On a 1997 Ford Aerostar, the hazard flasher is located on the dashboard, typically near the center console. It is a red button marked with a triangle symbol. Pressing this button activates the hazard lights, allowing all turn signal lights to flash simultaneously in case of an emergency.
Aerostar was created in 1953.
The Engine Control Module (ECM) of a 1996 Ford Aerostar is typically located under the dashboard on the driver's side, near the steering column. It may be mounted to the firewall or in the vicinity of the fuse box. Accessing it may require removing some covers or panels for better visibility and reach.
Usually, the headlights are protected by a self-resetting circuit breaker located in the fuse block. It looks like a big aluminum "fuse". If it is failing or is being overloaded by accessory lights, the headlights will blink on and off. 2/5/09 The headlite switch socket may be burnt due to heat.