I have tried and tried and I cannot igure out why my parking lights and turn signal lights are not working. The fuses are fine and wires are in good shape. Now, the headlights work, but nothing else. has anyone else had this problem are cn supply some good ideas? Thank you
Sounds like two seperate problems. The running lamps and brake lamps are seperate circuits. For the running lights, is there power in and out of the headlamp switch? You should be ablt to verify by checking the accessory light connection at the fuse block. Have you recently dis-connected any of the wiring looms from the fuse panel? If so perhaps some of the wire connections are not making contact. The brake/turn signals can be affected by the relay, turn signal switch, and brake light switch. If the turn signal switch is not operating/connected lots of stuff stops working.
O.K., thanks for the replies. It is a 68. I was able to get power to all lights. My new problem is that when I pull the knob on the dash to activate the marker and r/s lower valance lights the work, when I pull the knob all the way out to turn on the headlights, the power to the previous two goes out and the headlights stay on. Hmmmmm, what could case this, incorrect hookup?
I think I understand your explanation. When the headlamp switch is in the running-lights only position, the side marker and running lamps illuminate, but when the headlamp switch is fully engaged they go out. Do the side marker, front and rear running lights illuminate brightly when turned on in the running lights only position? If so it may be a switch problem. The grounding mentioned by JimM is totally valid. Some telltale signs are dull illumination and the dull lighting of both bulb elements when the running lights and turn signals are used at the same time. I believe that all of the front lighting may share a common ground but my brain is failing me. If the lights are bright at one switch position and off the other I would suspect the switch (check light plug with a voltmeter to the positive terminal). If there is voltage, it's likely a ground problem.
CarlC- I think you might be on to something because my turn signal lights are not activating. Neither are my brake light or rear turn signal lights. I really have not messed with anything, but it is always possible that a wire came loose, although anything can happen. I want to thank everyone who has replied and any future responses. It truely is appreciated, just can be frustrating sometimes. OHHH, what realy are you refering to in your message?
The brakes lights and turn signals are the same circuit. The flasher relay acts as a on/off switch. The flasher is normally on so that when you press the brake pedal, the brake light illuminates. When the turn signal is activated, it turns the appropriate brake light on and off. In this case, all of the brake and turn signal functions are routed through the turn signal switch. On my '68 I had the turn signal switch connector push a single wire out and not make continuity. That caused a bunch of headaces and was a pain to track down. It coud also be the switch. Fortunately, you can still buy these from GM. They come with an adapter to fit the older style connectors but the switch is a perfect bolt in item.
I had an interesting problem that I debuged a couple of weeks ago.
My park lights and turn signals would not work on my 67. I check all grounds to no avail. Then one day I decided to pull my instrument panel to replace the bulbs. I noticed that my center screw in the bezel was missing so I replaced it instead of working on the panel that day. Well, the park light and signals starting working again. I remembered now that there is a ground strap that that center bezel screw goes thru. So I would keep that in mind in the future for ground problems! Also another tid bit, if the head lights won't come on it's probably the dimmer switch. It completes the headlight cicuit on a 67. Found out the hard way on that one!
After rooting around under the dash working on something unrelated, my headlights would not work. All the other lights worked and there was power to the switch but not beyond. It turned out that the headlight switch connector had come loose and when I plugged it back it one of the switch contacts just bent over sideways. It had been a while since I was under the dash so I had forgotten I even touched it.