Turn signal and brake lights won't work, - Cars & Trucks

Look Behind the triangle panel on the left side of the bike. Next to the battery. FUSES

Sounds like a short in the socket or a bad ground.
The parking light is one circuit and the brake turn signal is another.

Well the brake light and turn signal circuits are on two different fuses, but they both go thru the turn signal switch.
So I would start by checking for power in and out of the turn signal switch for each circuit.

I'm checking into that same problem for a early 90's buick ( it's a GM also ) , I've checked the obvious ( bulbs, flasher,fuses,etc) all where fine. I assume your front turn signals work if you manually operate the turn signal switch or put on the hazard switch? The Buick's rear lights won't come on even with the hazard switch on. When you say one tail light has been out for some time, do you mean the brake/signal light or park/running lights? The Buick was like that with one side out for a while ( brake/signal light) but both the rear park/running lights work. Now, I've narrowed the problem down to the turn signal switch. I'd bet money on it. I just have to dig out my steering wheel puller, bite the bullet and get 'er done. You should be carefull if you're attempting that repair yourself ( AIRBAG ), use a manual. ( You could do a quick test by trying the turn signal while you pull the bottom of the arm toward you,move some of the wiring in the column near the arm,etc. I did and the signals started working. Could be the switch,dirt or a broken/loose wire. there's a lot of wiring going through the column and a lot of movement ( turn signal,high beam,cruise, then add tilt) Hope this helped.

replace the bulb

need to check the multi-function switch. the brake light signal goes through the turn signal switch on the steering column. the brake lights come on if the turn signal is not being operated. the circuit for the brake light can loose contact in the switch.

Hi,
First check the fuse in the fuse box for signal light, replace the fuse with similar value if it is busted. If the fuse is still intact the problem would be the flasher relay( small cylindrical aluminum ) that is already malfunctioning.

Hope that helps you out!

possible multifunction switch gone bad for turn signal problem. do headlihgts come on in a dark setting on automatic or not? if they don't come on when it is dark then most likely bad light sensor in top of dash or maybe unplugged if recent dash work has been done.

there are several causes, check bulbs first. A crossed filament in a bulb can cause similar problems. The brake & turn use the same filament so if the brake lights are on, due to a bad switch underdash, the turn signals won't work.

possibly flasher unit faulty
or turn signal switch