Turn Signal Lamp Stuck On

I've got a 1989 Chevy S10 Blazer. A strange problem just occurred tonight.
The left turn signal indicator stays on steadily and the driver's side turn signal lamp stays on at all times...when I make a right (or left) turn, the signals behave normally...when the signal is done its back to the steady left signal indicator

Others have already indicated the likely prospect of a faulty ground.
However, these S10s and several other GM models have interesting front turn signal wiring that can behave just like a bad ground. The front sidemarker lamps are wired across the turn signal and parking lamp feed, and are not directly grounded. This is groovy; it makes the front sidemarkers flash with the turn signals as well as burn steadily. However, due to the nature of the GM system's grounds, if the sidemarker bulb *and* the front park/turn bulb are not in perfect condition, you can get bizarre and seemingly-impossible symptoms.

thats what its there for!

I think its telling you that you have a bulb burned out. Its not the turn signal bulb. Its in the turn signal housing but its a small bulb that can be seen from the side of the truck. Turn on your park lights and look at the right side of the truck. You have a parklight that is seen from the front and another (smaller) light that's seen from the side. If you turn on the right blinker, it blinks in front and on the side. Do the same on the left. The small bulb to the side of the truck is not working. This might all be for nothing, cause I've been wrong before. GM started this stuff in the 70's I think. On older trucks, it was a "clearance" light in the fender (separate from the turn signal, but it blinked with it.

Move to Fort Meyers and you will fit right in with all the other seniors.

The left turn signal indicator in the dash is stuck ON only when the headlights are turned on. The left turn bulb on the front blinks when turning, but is off otherwise...unlike the right front turn bulb. Are you telling me that the steady left turn signal indicator is telling me to replace the front left turn bulb?

Thanks for the good info...that sounds like the problem. Now, is this bulb easy for a novice to replace?

The bulb thats "steady on" does appear a bit dimmer than when its blinking.

How do you pinpoint the bad ground?

Should be pretty simple. If the lense has screws, you remove them and the whole thing comes out as an assembly. The light fixture comes out by a quarter turn left. The bulb is a straight plug in. If it doesn't have screws, you'll have to reach behind the fixture to remove the light but it should be easy too.

Your sense of humor eludes me.

The first step is to get to the bulb and manually ground the negative/ground side with a piece of wire. Don't accidently ground the 12V side or you'll pop a fuse. If it fixes the problem, you've confirmed the diagnosis.

The fix can be done one of two ways. The first is to find the broken ground. It's usually not a broken wire but rather the connection from the wire to the chassis that's corroded and needs to be cleaned up.

The hack fix, if you're not a perfectionist, is to just run another wire.