Electrical gremlin

[smith]

My left brake light does not work. Replaced rear wiring harness, no change. Replaced harness that goes from the rear harness to the fire wall, no change. Replaced the brake lamp plunger switch at the pedal, no change. What next? Where do the wires that are behind the fire wall end up?

The weird thing is that it is just the left one- and no it's not the bulb...checked that 3 times first.

Help!

Thanks.
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[Baketown Scotty]

Check to see if the bulb socket is grounded.

[1rippen6]

The brake lights work through the steering column also because of the turn signals may have to replace the turn signal cam in the column. Would definitely check ground first see if you are getting power to the socket with a test light on a good ground.

[smith]

The only ground I know if is the one that come off of the side markers and they are good.

I looked closer and the tail lights use the top filament in the bulb and they work fine. The turn signals use the bottom filament and they work fine. The brake lights also use the bottom filament which is the same as the signal so I know the filament works- it just has something to do with the signal getting to it. Part of me wants to say hell with it before I end up with nothing- I hate electrical problems and maybe have gotten OCD in my old age and want it fixed.

The turn signal thing might be next. My turn signal plastic cam thing is really loose and old and it could probably stand to be replaced anyway. Any advice on doing that as the next step would be appreciated.

Thanks for the help!
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[JJLT1]

if the turn signals work then the wiring, bulb, ground is good..

x2 check for power in and out of the turn signal switch, connector on the column..
wiggle the turn lever while checking for power on the yellow wire..

depending on the year??
white from the brake switch
yellow to the left turn/brake
green is right..

[Jurassic-1]

Some times the brass contacts in the turn signal switch will get gummed up and have a connection problem. You can remove the steering wheel and remove the springs holding the contacts and clean the connections. Remember if you use a small wire brush to disconnect the plug or unhook the battery first. If it looks worn or your switch is defective it is not too difficult to replace the switch while you are in there.

[smith]

Thanks for the help guys.I guess the next step it to install this thing I got from LMC. Any advice on doing that would be appreciated. On a scale of 1 to 10 how hard is it? One of the few things I haven't torn apart on this truck is the steering column and I have no idea where to start other than taking the steering wheel off...

[hemi43]

The PITA part about installing it, is that you have to take most of the top of the steering column apart to be able to fish the connector through. With a bit of patience and a couple beers you'll get it done.

[smith]

Replacing that part did the trick. Thanks for the support guys.