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Check the low beam fuse in the fuse box, usually a 20A. If the fuse is blown/shorted during the replacement of the battery, your lights won't work. Replace the fuse if that's your case. Hope this helps.
ballast--- -usually a ballast transformer used in flouresent lights to turn 120 volts ac into 2000 or 3000 volts ac at a lower amperage. the ballast transformer has 4 nuts ,one at each corner for physical mounting .2 wires for the ac line cord and 4 wires for the flouresent tube. wires are connected together with wire nuts that can be pulled off the wires while unscrewing the wire nuts. make a picture of what color wires go where,take wires off one at a time and make pictures. the wires are not interchangable and must go back exactly where they came off from or the unit will never work again. many ballast transformers have an electrical diagram showing where the wires go. you may need a magnifing glass to see it well enough read it. Please study the diagram and understand it before you begin disassembly. WARNING: You must make sure that the electriic cord is unplugged or the circuit breaker on the OFF POSITION with the electricity on ,you can be electrocuted by either the 120 volts ac or the 3000 volts ac that means crash,burn and fry. so de-energize first. The replacement ballest must be rated for the wattage of the flouresent bulbs ,the length of the flouresent bulbs and the diameter of the flouresent bulbs. that are in the lighting fixture. the flouresent bulbs also have their own make and model numbers.the model numbers of the bulbs are standardized throughout the industry. The model number of the flouresnt bulbs that a ballast will work with is on thw ballest sticker, on the cardboard box and on the directions.the salesman in the flouresent ballest [lamp] section at home depot or lowes should also be able to help you.
Yes, it does have a flasher, although it may be a combined unit with the hazard flashers relay. So you hear the clicking of the flasher relay? That seems to indicate the relay is working properly. Have you checked the bulbs and the turn signal fuse? Any turn signal bulbs light up anywhere, front or back?
How about your brake lights, do they work? Your car may have separate, stand alone turn signals in the rear, but many American cars use the same bulb and same filament on the bulb for the brake lights and turn signals. If your merc is like this and the brake lights work, then the bulb must be good. Turn on the hazard flashers and see if all bulbs work and flash at each corner of the car. This would be the same bulb as for the turn signals. If they work, it could be a bad turn signal switch, may even be the flasher relay somehow malfunctioning, and in a few cases, a bad hazard switch can affect the turn signal switch. Check fuses and bulbs first. If you have any type of body control module that controls lights and other accessories, you may have to investigate that. I know I'm not being very helpful, just throwing out a few suggestions. Good luck.
If all your lite bulbs are out, or don't work as you say in your dash, there is normally only two places this can be. Number one, make sure that your dimmer for your dash did not get accidentally turned off. Meaning a lot of cars and trucks as you know, you can turn down or turn up the brightness of your dash lights by a couple methods. Some have like a dial on there dash area, to turn, or some are on the actual light switch that turns. If this is all on and working good, then the only other place it normally would be is a fuse. And that should me marked as dash lights and in your fuse panel. Check in your operation manual for location of fuse box. Or if you know where this is, then open up and look for a fuse that would say, dash lights or interior lights. I hope this helps. MIke
You most likely have a bad bulb, if the front bulb goes the rear wont work and vise versa both bulbs must be good to complete the cirrcut. Even though you have no lights you should still hear the flasher relay. Bulbs are cheap just replace both and you'll be good to go. Good luck
I would focus on the connections going to that head light for the low beam. I agree, it is not the switch, otherwise other side low beam would not be working. It is most likely bad bulb inlet( if it i separated bulbs for high and low) or it is the connection going to the low beam that operates it. Hope this helps. Don't waste your time on switch, it is not that.