LH turn signal indicator lights up when I turn on the headlights. Big deal or not? (Page 2/2)
fierofool NOV 01, 09:16 PM
Does your parking light and clearance marker illuminate? That's where the defective equipment citation would be seen from outside. Mine work, when the turn signal is activated, but don't illuminate, otherwise.
RayOtton NOV 02, 06:11 AM
Yes, everything lights up normally. High beams, low beams, parking lights and turn signals front and rear.

Plus, with the lights on the LH green indicator light blinks the way it should when the stalk in depressed for a left turn. It returns to constantly lit after the turn is completed.
Daryl M NOV 02, 04:20 PM
You may have a bad bulb. If a burned filament end attached itself to the wrong place in the bulb, it can cause that.
donuteater306 NOV 02, 11:57 PM
I've seen this happen twice on other GM vehicles. One time it was water that had gotten inside of a trunk, the tail-light harness junction was submerged. Fixing the leak and drying the connections fixed the problem.

2nd time, someone had mistakenly installed a 1156 (single filament) bulb where an 1157 (dual filament) bulb should have been. A fuse blew and caused a ghost current (or whatever it's called when electricity is redirected).

If everything is dry, I would remove one bulb at a time, checking the green indicator each time you take a bulb out. Don't put the bulbs back in until you find the one that turns the indicator off. Then hopefully you'll know which circuit to follow.

[This message has been edited by donuteater306 (edited 11-03-2018).]

theogre NOV 03, 03:02 AM

quote
Originally posted by donuteater306:
2nd time, someone had mistakenly installed a 2057 (single filament) bulb where an 1157 (dual filament) bulb should have been. A fuse blew and caused a ghost current (or whatever it's called when electricity is redirected).

2057 1157 2357 are all dual filaments and bulb base is same for them and Fiero OE bulbs for brake/park/turn are 2057. Only diff is power used by the filaments. (Later GM and some others have 3x57 bulbs and are same as 2x57/1157 but have a wedge type base.)
Some sockets let you to used 1156 and other single filament bulbs and can short the socket power pins to each other. This often won't blow a fuse when that happens.
See my Cave, Lighbulbs

[This message has been edited by theogre (edited 11-03-2018).]

Indydreamcar MAY 30, 03:09 PM

quote
Originally posted by theogre:

See my Cave, Sneak Path





Ogre, I and the '88 GT I'm restoring thank you. The ground was loose in the left front turn signal socket. Because of your post and info, it took me 5 minutes to remedy. Thanks so much!

[This message has been edited by Indydreamcar (edited 05-30-2019).]