Front DS Park and DS Marker light have low voltage (Page 1/1)
da.slyboy OCT 22, 11:33 AM
I have an issue with my front park/marker lights on my 87 gt. It appears to be doing the "sneak path" issue as they don't appear to be turning on with the parking switch and I get the LH turn signal indicator staying fully lit when it happens.

LH turn signal works for the the front but not on the side marker light.

As per suggestions on fixing this issue, I cleaned the ground connection by the DS headlight and checked the front turn signal bulb/socket and cleaned any corrosion. Also replaced with a new lamp. After testing again, I still don't get the parking light from either to show but can tell a very low voltage is going through it as the filament just has a tint of orange. Checking the voltage on the side marker shows around 1.68V. The pass side shows 11V (car off and have used electrical on the car multiple times without recharging

I guess my next question, is what should I be looking for next? Wiring in that area looks good, there was corrosion on both front and side sockets that I thought I clean up pretty well. Also have new lamps for each. I just assume if I still had a grounding issue I wouldn't have any voltage at all. If so what other ground locations are there in the front compartment?
theogre OCT 22, 05:00 PM
See my Cave, Sneak Path and top of LED Marker Light how marker works.

pull turn/parking bulb and socket out the back.
Turn on park or turn and look at bulb.
Should not see both filament on at same time.

if you do or have dash turn bulb on w/ park on then that bulb still has ground problems and front marker won't work.

Use standard 1157, 2057 (Fiero Spec bulb), or 2357. Not any LED "replacements."

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave