1050rayvette

Working on the final bugs on a 64 convertable restoration and have the following perplexing situation.
Do any of you gents have any suggestions on why my RT front turn signal works fine however the bulb will not light when I turn on the parking lights? All other lights light up fine...... have already replaced the pigtail.....and thinking maybe the headlight switch....possibly? Thanks in advance for your suggestions.

BADBIRDCAGE

Let's go for the obvious. You replaced the pigtail. Have you checked power on both circuits with the replacement part? If you have power on both circuits then we go to the bulb. If the left front bulb is working on park then there should be power to your passenger side on park as that is a common/shared circuit. Should not be a headlamp switch issue.

6D2148

ground,ground,ground

DansYellow66

I'm trouble shooting a similiar problem on a fiberglass car except the parking light works and turn signal filiment isn't. There are two hot leads to the light - one for the parking and one for the turn signal. There should also be a ground which appears to be there since the parking light works. You can pull the plug and the lens off and jumper from the plug to each contact on the lug to verify both filiments will light in the bulb. With the parking lights on that testing with a test light should also identify which lead is for the park light filiment (the wiring diagram can also tell you) and which is the lead for the turn signals. Then trace that parking light power wire back through the harness to see if you have power at any point. I would say the light switch is a good guess but maybe not.

6D2148

reground that light assembly, with a jump wire at the same ground as you grounded your test light and all will work as it should

65GGvert

and make sure you have the correct double contact bulb. It won't be in the switch. The voltage goes to the left parking lamp and then splits and goes to the right from there. If the left is working, so is the switch. The problem will be from the pigtail on the left over to the right and then that pigtail or ground. Measure for 12v on the purple wire and then follow the wire over to the left and see where you lose it.

1050rayvette

I thought that the Rt light would get its power via the Left first, but wanted to ask those that may have been through this before to save me steps I don't need to take.
Its all great advice.....Many Thanks!

Dennis Beck

65GGvert

Focus on the purple wire in the rh socket and connector. If it's not there check continuity over to the lh connector. That's where the purple wire for the rh side doubles off the one for the lh side and feeds over. You've either lost connection at that split on the lh side, or lost continuity over to the rh side, or the rh connector is not making a good tight connection, or the rh socket is not making contact to the connection on the bulb. That bulb uses a single ground (the base of the bulb) which makes contact to the metal surround that holds the bulb and is then run to a solid ground. If the turn signal is working (correctly) , the ground is making contact.