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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 01-16-2009   #1 (permalink)
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Default 67 turn signal problem. help?

My turn signals broke about an hour ago. If i flick the ticker to turn left the right side brake light gets brighter and visa versa... um.. help?
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Unread 01-16-2009   #2 (permalink)
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Can you offer some more detail as to what you and or the car were doing at the time? Are you working on the car, driving, anything? Have you checked your relay? Is it still connected properly?
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Unread 01-16-2009   #3 (permalink)
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i was just driving... the light for P R N D 1 2 doesn't work either. so its the relay?
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Unread 01-17-2009   #4 (permalink)
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Not sure if a bad relay would affect those lights. Usually a bad relay just stops working, not affecting anything else. I'm new to classic mustangs, but I've just replaced my underdash harness, so I have the diagrams out in the garage. Let me take a look. Have you looked under the dash to see if there are any loose wires or something that may have shorted?
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Unread 01-17-2009   #5 (permalink)
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Could it be the brake lights or just the flasher unit?
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Unread 01-17-2009   #6 (permalink)
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Call66GT has a very good point. When working on cars, it's 99.9% sure that whatever you did to it last is what caused the problem, even if it seems unrelated. So, have you done ANY work at all to it? If so focus there.

If not, then check the easy stuff first.

Pull the tail light lens and check the bulbs. If one is heavily corroded it could be causing a short. Also, check your trunk wiring for any fraying, especially as the wiring harness disappears into the wheel well. They can get caught on sharp metal edges there and fray and short.

Next would be your flasher unit. It's the small silver cylinder with 2 wires going into it, tucked up under your dash near the steering column. Again, cheap fix and easy to check.

Next would be your turn signal cancel cam. This is the white (or dirty white mostly likely by now) plastic part under your steering wheel, at the top of the steering column. This is where your turn signal lever goes into the column. You'll need a steering wheel puller to get the wheel off. Then check for blackened areas, loose connections or melted plastic. This area sometimes gets hot if there's a short and will give intermittent problems.

Good luck. Post back when you find it.
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Unread 01-17-2009   #7 (permalink)
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I sent it to a guy who rewired some of the electrical in the engine compartment... i think i need to pay someone a visit.... i don't have a steering wheel puller but my guess is the problem is in the steering column... All together, the hood lights, dash bulbs and brake lights wont indicate when I'm turning... so far all i have done to the problem is check the turn signal wiring in the back of the car and behind the dash, I'll go check the flasher unit. Oh, if i say something dumb, I'm sorry... i have only had a weeks worth of learning... the rest I'm teaching to myself via a shop manual and some cheap restoration book. I'm trying to learn most of my stuff through you all i dont have anything that tells me the location of the relay....
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Unread 01-18-2009   #8 (permalink)
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Thin Mint, don't stress it, we're all working together in here. I have many posts with my own issues. In fact I'm working on the very same issue as you, although my problem is self inflicted. I installed a whole new under-dash harness. Keep reading and keep asking questions......

You may already know this, but I've attached a photo of what your relay should look like. Depending on how your main harness is wired, you should see it somewhere behind the instrument cluster towards the firewall (I think the factory install was on the cowl air duct), or along the left-hand side near the fuse panel.

The other thing you can check is the harness connection from the steering column wires to the main harness. Trace the wires from you steering column and you should find a 6 pin connector. check to make sure you have a good fit and nothing has broken free.

Hope that helps, post back.
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67 turn signal problem. help?-flasher-relay.jpg  
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Unread 01-18-2009   #9 (permalink)
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yeah that helps. i think i'm going to pay 5 bucks for a new flasher unit... replace the old one and if things are still wrong i have to pay some guy a visit.. there is a new problem with the car... involving a new brake booster my parents hired some guy to put in ...
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