Left front turn signal and indicator Dead

[Snocap]

I've been lurking for some time... but finally have a challenge.

Issue: the Left Front turn signal and the dash cluster indicator for the left signals don't light up. The left rear turn signal flashes okay, though slower than the right side (signifying no draw from the left front).

I've verified the left front light and housing are fine by using the left side to feed power to it at the connector through the radiator support flange. I've also verified the left side dash light filament is good and have replaced the dash signal light socket.

The left front signal works fine on emergency! Don't know if it is normal but when emergency blinker is on, the emergencies will stop when braking.

Any ideas of what else to check, verify? VOM at the ready. TIA

Bill

[Stocker]

Originally Posted by Snocap

Don't know if it is normal but when emergency blinker is on, the emergencies will stop when braking.

Wish I could help with your problem, but..... at least I can answer this part. Yes, it is normal on these trucks.

[Snocap]

^Mike^
Thanks

[Andy4639]

Yes the emergency lights will quit blinking if the brake pedal is applied.

Now for the turn signal.

With key on front bulb out take a test light and see if you can get it to light up by touching one of the connectors in the housing. It should blink just like the bulbs. If not take the connection loose at the core support and try it there. If you get power there it's between the connector and light housing.
If you don't get it there go to up under the dash at the column check the wire for turn signal there. Just keep back tracking until you find power.

[hamjet]

Also, the case of the front turn signals have to ground to the grill. while the nonworking turn signal is on, take a screwdriver or something sharp and wedge it between the grill and turn signal case to make good ground and see if it lights. it happened to mine..

[TNTsigns]

If none of the above work. Check the turn signal switch under the steering wheel. The switch will not make proper contact due to dust or light corrosion. It is a pain to remove the steering wheel. I have had to do that on several of my trucks in the past.

[Snocap]

Well still tracing the wire. No power at the engine side of firewall except when emergencies are active. Since emergencies are active I'm thinking that the issue is the switch itself as the same wire is used for both.

[Snocap]

It's the switch, turn signal. So guess we will be pulling the SW. I may be able to bend the contact. We will see.

[Poky67C10]

Just following this. I'm kinda in the same boat with my front turn signals

[Snocap]

After tracing the wires I found no power to the entire wire. So took her on a drive. And suddenly I had intermittent good connection signified by the turn signal indicator. So after I got back from my drive I lightly pressed the lever and was able to replicate the now working lights. Hope this helps someone else. I will likely not pull the steering wheel for a week or so. News at 11.

[74baggedbug]

Any updates experiencing the same thing now

[VetteVet]

Originally Posted by 74baggedbug

Any updates experiencing the same thing now

Here is how to test your turn signal switch without pulling the steering wheel.

http://67-72chevytrucks.com/vboard/s...d.php?t=695511

[74baggedbug]

Originally Posted by VetteVet

Here is how to test your turn signal switch without pulling the steering wheel.

http://67-72chevytrucks.com/vboard/s...d.php?t=695511

Started tracing down wires and found a bad connection under the dash.. Fixed now thanks

[snipescastle2]

Look at your steering column "half Moon" connector, those sometimes work loose and might be a culprit, also mice have a tendency to chew through wires, might have a broken connection.
Ben

[Snocap]

Sorry as have no update. Have had too much work on house Etc. Mine is definitely in the switch, just need to pull it. Glad you found your bad wire.

[custom10nut]

In addition to all the rest of the advice, check all your wires for breaks. I've had wires break, but the outer shell stays intact. Also, check any connection for corrosion. Here is SC, the humidity reeks havoc on wiring. My truck has been sitting for a while, so I'm having the same issues that you're having.