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For some reason my 2000 mustang gt is having this problem where the passenger side headlight and foglight dim very low and the turn signal light doesnt work at all. the turn signal light on the dash comes on like the bulb is burnt out but it isnt and my abs light comes on at the same time as all this is happening and kicks the abs in every second or so when im on the brakes. i have no idea about wiring on cars and im pretty much at a loss for what is going on. i REALLY need some help or advice on this one ya'll. Much appreciated,
Jar3dmcd
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2000 Mustang GT, Jet Black Mods Listed on profile.
Do the obvious first. Follow the wiring and see if you can see any damage anywhere. Pinch points, wire rubs, corrosion. Disconnect harnesses to look inside.
My taillights were doing the same thing, it was on but very dim and would kind of pulse and sometimes it wouldn't have any problems. I replaced the bulbs and it fixed it. To to a cheap check take the bulbs out of the other light and test it. Fuse could be blown and like said above look at all your wires.
Check the alternator output with a volt meter, it is common for these cars to start dropping voltage when the alt gets old. Beyond that, look at the connections and especially the grounds.
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STEEDA AUTOSPORTS
AMERICAN PARTS FOR AN AMERICAN ICON
Ive followed the wires back and the harness appears to be fine with no pinches or anything, i think ill try the bulb thing although i dont know why the ABS light would kick on if its just a bulb...
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2000 Mustang GT, Jet Black Mods Listed on profile.
My guess is that you have a connector or two common to these circuits that is dirty or partially oxidized so that it's not making 100% contact at all times. It is probably on the low-amperage side ahead of the relay box. Trace back from the relays, disassemble the connectors, inspect and clean with silicone spray then reassemble.
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2005 V6 MT - Pypes X true dual with GT mufflers - GT suspension and wheels - Prothane shifter bushings - GT Fogs
Light dimming randomly 
