Check the bulb. It may simply be a burnt out bulb.
Check the fuses. Looking at the fuse, there is a metal piece that runs the area of the fuse. If the metal in the middle is broken (link), you should replace. After replacing the fuse, if the light works, stops working, and you have another blown fuse, you may have a short somewhere. In that case, refer below.
Check to see if there is a wiring issue. It is possible that the inside of the headlight got wet or damaged and shorted out. I suggest getting the wires tested at this point.
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Hope this helps a little. There are fuses for left and right lo beams, did you use a test light and check voltage on proper fuse. If the lo beam works on the other side, the problem isn't the relay. might be the fuse or wiring circuit? Just my opinion.
On these cars the headlights get power from a right and left fuse and the headlight / dimmer switches provide the ground circuit. Both headlights are connected to one ground wire for high and one for low beam. So if one works and the other does not, the problem should be in the wiring before the headlight switch. Red is for high beam and red-white is for low beam. You should be able to jumper the red-white wire on the right headlight and make the low beam circuit for both sides work to test it.
well all i can say is he is not much of a mechanic for not fixing it for you so i suggest you find a better one ,sorry to sound so hard but ?? Their is always a way around any problem if going back to basics to know the problem ,no power ? then re run a new cable from the switch ,easy or am i being over simplistic here.What would have happened if i hadnt got the lorries to run and be on the road when the drivers start work at 07.00 in the morning .i would have been out of work ,fired ,sacked or whatever you want to call it
I would check the headlight switch. It could be that you are able to turn the running lights on but the headlight position is not working. Using a test light check for power at both sides of the fuse. When using a test light do not just check all fuses as you do not want to use a test light on the air bag fuse(s). If there is no power on both sides of the fuse (and you already check that the fuse is good) then there is a problem somewhere in the electrical. If there is power at both sides, then the next area to check would be the headlight switch. If the vehicle has fog lamps, turn them on then turn the headlights on. The fog lights should come on. If not then you can almost guarantee it's in the switch as it controls both the fog lights and headlights. Pull back on your turn signal switch (or push it forward) to see if the high beems come on. If they do not but the fog lights go out, then it's highly probable that the headlight switch is bad.
The low beam headlamps have a seperate fuse for each lamp in the central or underdash fuse panel.
The right headlamp is fuse fuse 26 (10amp) and the left is fuse 28 (10 amp). These fuse are hot only when headlamps are on so you need to test them with a test light with headlamps on. If they do not have power to them then concern is either headlamp switch or daytime running lamp relay if your vehicle is equipped with this feature, or a bad multifunction switch.
Power leaves the headlamp switch on the RD/YE wire and goes to multifunction switch. It leaves multifunction switch on the other RD/YE wire The wire will then go thru either a connector c2003 located behind the passenger side air bag behind the dash or to the DRL relay if your vehicle has this feature and leaves there on RD/BK wire to the headlights .