Lights were working fine then all of a sudden I switched the truck off when I got back in and turned the lights on they don't work. I replaced the dimmer switch that didn't work so I replaced the bulbs now the wipers, brake lights or the head lights won't work. What could be the problem?
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Re: headlights won't work
Look under the Hood and Locate the Fuse Relay Box. There are Relays in this Box for these Lights. They might be Labeled ILLUMINATION, Not Sure But, They are in there. The Diagram of what is What should be Inside the Box Cover, If not, It is inside the Owners Manual. Please Rate My Response! Thanks!
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Could be the headlight switch. The switch has two sets of contacts for the parking lights, the park position and headlight position. You may need to check the circuit at the switch to see if you are loosing power when the switch is moved from park to head.
I have had this happen before - this is the multifunction switch on the steering column. The one on my Ford took about 10 minutes to change (two bolts). My problem - I would turn my lights off, then turn them back on and nothing, then they would suddenly pop on. after a bit my lights would not come on at all. I had to drive with my Flash to Pass lights for a couple of days when driving at night.
Sounds as though you have an exposed electrical connection that's either getting splashed from the tires, or the moisture is creating a temporary disconnection. This can happen, but once it dries it will resume working. I would have your electrical system checked. I would also have your headlight switch checked for a possible short.
Sounds like a bum relay in the main underhood fuse box. My complete illustrated tutorial for repairing this $80.00 part is here: http://www.customsaab.com/Custom_Saab_NG900_OG9-3_Performance_Articles/p2_articleid/24