Left rear light won't work using turn or brake, running light good
The left rear brake lite and turn signal won't work, I have cchecked the connector and completed a connector volt reading and ohmed out wires thru the connectors and wire as far a I can reach in the jack compartment. All is good but no joy at the connector for voltage, compared to right light connector. I also checked the left and right fuses in the fuse box on the inside instrument panel. I don't have a schematic for my explorer sport 2001.
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Re: Left rear light won't work using turn or brake,...
You can purchase a haynes or chiltons guide those will have that information and more. Have you replaced all of the bulbs within that light? sometimes one bad light can make them all not work right. Thanks, Lee
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Has the vehicle been in an accident on the left rear side. First check the bulb to be sure it is not defective, trade it out with the side that works properly to test. If the bulb works well then My thought are you may have a shorted wire. The turn signal flasher works by heat build up within the flasher the heat is caused by the load of the bulbs, the load heats the metal spring causing it to open the circuit then as quickly as it cools down the circuit closes again lighting the bulbs.
There is also a possibility of a defect in the turn signal mechanism on the steering column. The turn signal switch on many models does three different things on many models that use the same bulb element / or bulb for brake and turn on rear of vehicle. It controls the circuit for brake light by sending power both left and right side rear when turn signal is in neutral position then when turn signal is in left turn the switch cancels brake light power to left side rear and supplies flasher power to left side while maintaining brake light supply to the right side rear, and so on opposite when the right turn is chosen on turn signal switch. The turn signal indicators on the dash normally run off the same circuit as front turn signal bulb only which is also controlled by turn signal switch. Front has turn signals but no brake light.
I think there is an additional load on the left side rear turn circuit and it could be either a wire that is shorted or the turn signal switch if the same bulb element is used for both functions.
Often times if trailer lighting is connected the flasher will also blink a little faster because of the extra load of additional bulbs.
Just had a similar question last week, and the solution was a bad socket/bulb holder. You might try and see if there is current in the brake light wire leading to the bulb holder. I have used a jumper wire and a safety pin to test the wire behind the socket. I pierced the plastic insulation of the brake light wire with the point of the safety pin, and either use a tester or even a good working bulb and a good ground wire. Be blessed.
Use this as a guide and a 12 volt test light, or multimeter to see if power at proper terminal from truck. If power there, then connection at trailer plug, or wiring from there to tail lights on trailer is faulty.
Most likely a bad multifunction switch (turn signal switch), try wiggling the turn signal lever while it is turned to the left and see ifit ever works.This is extremely common problem on fords,but not the only one, could also be a broken wire ,bad ground or a bad light socket.
Is there a switch on the left side of the dash that has a red lens and a wavy line across it? If so, you have a rear fog light switch and it has been activated, causing your brake lights to come on each time you turn your headlights on. Flip the switch and the rear lights should display only the parking lights with the headlights on.