Originally Posted by rockchucker
My guess would be a sticky relay or water getting into the relay box. Is the cover on the relay box under the hood? Are all of your splash shields in place to prevent spray from getting into your engine bay?
You can test and check your relays here...
This is a link to a Nissan forum that I am on but the relays are basically the same for all cars. If they hesitate or stick then they need to be replaced right away.
300zxClub.com (Nissan 300ZX Forums)
I spent a lot of money on expensive ford relays that were just fine so don't waist your money unless you are sure. My problem turned out to be a faulty daytime running light module. Unpluging it fixed the problem. I just have to turn my headlights on when I drive now. The ford electrical diagrams do not show the module so it makes you think it may be a relay. This is a common problem with ford along with many other things.
ie. peeling paint, heater blending door failure, seatbelts releasing,....
No wonder these companys are in trouble. I personaly am getting sick of fixing substandard equipment.