MISSING... one signal

[torquemonger]

all my lights work, except my right rear signal, brake light, and reverse light!!! but the taillight works???? i cannot for the life of me figure it out... could it be bad wires or just the turn signal switch in the colum?

[fmartin_gila1]

Sounds more like you have a Grounding issue.

Fred

[fordman]

yes it could be the ground on the tail light housing screws.

[torquemonger]

i cleaned the screws up, aswell as the holes and still nothing. what else you got? could it be the wires running from the engine compartment down the frame to the back? i checked them but maybe i should just re-wire it and eliminate that possibility.
but the taillight works???

[knightfire83]

Working parking lights indicate at least a decent ground.

The turn signal and brake light use the same filament in the bulb. Could be as simple as a burnt out light bulb or broken wire leading to the socket.

The reverse light however is independent, it could be burnt out also or corroded.

I'd check the wiring under the bed to see if someone hacked it for a trailer connector, which is typical.

[fordman]

thos eare the first things i would check after the ground has been verified. bulbs sockets and hacked up trailer wiring. then i woudl move forward into the cab and check the column wiring plug and then up into the tss.

[Thunderfoot]

I wouldn't rewire it yet, that is a common problem of a bad TSS for the brake and turn light out, after checking the bulb of course. The backup light is a separate issue.
You need to check the "Green" wire on the TSS connector under the dash and see if it has power on it with the brakes on or turn signal on, if it doesn't then the TSS is the problem, if it does then you have a wire/connection problem from there back somewhere.

[torquemonger]

its looking like the tss is the problem. i traced all the wires and everything looks good..no previous hack jobs at all. bulbs are brand new and work on left side(both bulbs) heres the kicker...i spliced the turn signal indicator wire under the dash so that i now have a signal light, confirming a faulty tss...but, the brake light still dosen't work! it boggles me!!! the brake and signal share the same filement on the bulb.

[Heathcliff68f100]

But they both run through the tss,

[Thunderfoot]

Same filament in the bulb but 2 different circuits sending power to it, switching is done in the TSS. The reason the brake light doesn't work is the front lights don't have brake lights
The front and rear are also separate circuits within the TSS. When you turn on the Turn Signal to make a right turn the TSS disengages the right rear brake light and then directs the flashing turn signal power to it, if it didn't disengage the brake the light you would never see it flash as the solid on brake light would win over the flashing one.
Here is a pic of the TSS guts. the problem with yours is the contact point for the right rear wire. NOTE: you might also check that green wire on the connector itself at the bottom of the column and make sure it is making good connection on that pin with the TSS wire.

[The Good Humor Man]

Sorry re read the posting, and change my mind on what I thought it was.

[torquemonger]

Same filament in the bulb but 2 different circuits sending power to it, switching is done in the TSS. The reason the brake light doesn't work is the front lights don't have brake lights
The front and rear are also separate circuits within the TSS. When you turn on the Turn Signal to make a right turn the TSS disengages the right rear brake light and then directs the flashing turn signal power to it, if it didn't disengage the brake the light you would never see it flash as the solid on brake light would win over the flashing one.
Here is a pic of the TSS guts. the problem with yours is the contact point for the right rear wire. NOTE: you might also check that green wire on the connector itself at the bottom of the column and make sure it is making good connection on that pin with the TSS wire.

right on thank you for the help, i will update you with my progress pictures always help me too thanks

[ezernut9mm]

when you get the steering wheel off, just push down on the outer edges of the tss where it contacts the l/f, r/f, l/r, r/r wires and have someone watch the light in question.
my bet is the old tss isn't making good contact. i had this problem with a 66 f100.