I'm about to change out my headlight switch The wiring harness plug has a black wire in the plug and coming out i notice a 16A black-18 wire w/end connector just hanging there. My question is: Does this connect to a ground (If so, where?), accessory light of some type, or is there for extra hook up?
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Check ground wire from battery to car chassis (black) Check ground wires from headlight wiring harness to core support black wires should be attached to core support with 5/16 head sheet metal screws. the grounds will be on both sides near the headlight plug. Check bulkhead connector on firewall 2 piece square plug where interior wires come out under the hood. Drivers side by master cylinder. Remove and replace a few times to work corrosion off and re-tighten bolt.
12V CONSTANT WIRE RED and PINK/BLACK Ignition harness
12V IGNITION WIRE DARK BLUE Ignition harness
12V ACCESSORY WIRE BLACK/ORANGE Ignition harness
STARTER WIRE YELLOW Ignition harness
PARKING LIGHTS (+) BLACK/YELLOW At Headlight switch
POWER DOOR LOCK (5-wire reverse polarity) ORANGE/PURPLE Harness Coming Into Vehicle From Driver's
POWER DOOR UNLOCK (5-wire reverse
PINK/PURPLE Harness Coming Into Vehicle From Driver's
DOOR TRIGGER (-) YELLOW/BLACK At Headlight Switch
DOMELIGHT SUPERVISION (-) Use door trigger
TRUNK TRIGGER (-) GRAY/BLACK At Light In Trunk
TACHOMETER WIRE TAN/BLUE or BLACK/GRAY At Ignition Coil
BRAKE WIRE (+) WHITE/BROWN At Brake Pedal Switch
HORN TRIGGER (-) BLACK/RED Harness Coming From Steering Wheel At
CAUTION! SRS airbag wires are not enclosed in protective loom at the
steering column. They are a twisted pair of wires that run with rest of
ignition harness. Be careful not to cut or probe these wires.
(Black plug) Rear Right speaker -: Blue w/White stripe Rear Left speaker -: Brown w/Yellow stripe Front Right +: Purple Front Left +: Dark Green Rear Right speaker +: Blue w/Orange Stripe Rear Left speaker +: Brown w/Blue Stripe Power Antenna/Amp: White (Gray Plug) +12v battery wire: Pink or Pink w/White Stripe +12v Ignition wire: Red w/ White Stripe Front Right speaker -: Blue w/ Red Stripe Front Left speaker -: Brown w/ Red Stripe
Tools recommended for this job: wire stripper, wire crimper, volt meter, 4x quick wire connectors, 4x male crimp connectors, 4x female crimp connectors
First, tape the halo and/or LED wires to the back of the headlights to keep them from tangling.
Keep the pairs in order by their color, e.g. black, black (ground) and Red, Red (positive). Note: positive and ground wires might not always be black and red.
Remove some of the plastic shielding at the end of the wires to expose enough copper wire, next twist the copper together to strengthen it.
Shove the twisted copper into a crimp connector; crimp the location where wire and the connector end overlaps, wrap with electrical tape to secure it.
Two extra wires in black and red will be helpful to make the halo/LED wire longer to easier installation. Remove shielding: show copper: use the connectors: connect the positive and ground from the headlights.
Next step, turn the headlights inside the car to the [on] position.
Take the volt meter and connect the negative to the negative on the battery (please use extreme precaution when doing so).
The headlight harness usually will have  wires, generally red, black, green (headlights, ground, turn signal). Use the volt meter to test which wire will have power running through it (since the headlight is in the [on] position) which will be the headlight wire.
Use the quick connector to connect the extra wires (red) to the power wire on the harness and black to the ground. This will split the current coming from the harness. Crimp the connectors and use electrical tape to secure it.
Now connect the projector headlight halo wires and the harness from the car.
Don't have a diagram for that one but I'd begin by checking power and ground at lights and power on the "out" wire from the switch, and work towards the middle. Also check power distribution center and see if there is a fuse, relay or both for that.
Sounds like you have a ground problem on the lights.
I'm assuming that the front lights that don't work are the directionals.
You might want remove one then turn on the headlights and try a
temporary ground wire to the black wire. If it works then either check
your ground wire from the battery to the chassis or install a separate
ground wire the the light assembly.
As far as blinking fast, make sure all your lights are working. If one bulb is out that could be the problem.
Replace the dimmer switch.