Strange turn signal problem - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 5 (permalink) Old 04-10-2009, 05:18 PM Thread Starter
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Strange turn signal problem

I have a strange problem with my turn signals on a 79 Alfetta sedan. They work only when the headlights are off. I looked through the electrical threads and did not see this problem. Any insight?

Leonard

79' Alfetta SS
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post #2 of 5 (permalink) Old 04-11-2009, 02:21 AM
CanukSpider
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This would make me look first at all bulbs and sockets. My first thought would be a short in one of those. Then second the switch.
Always look for the simplest things first. After that check the wiring.
One bad socket or the wiring to it can cause this type of problem.
Just a thought, I do not profess to be an expert in Alfetta issues.
But I have had many sports cars with issues. (or is that issues with sportscars) Most of the time I win.

Happy hunting.
post #3 of 5 (permalink) Old 04-20-2009, 02:42 PM Thread Starter
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update

Thanks for everyones help with the turn signal problem. I checked all the grounds, cleaned them and retightened. Checked the bulbs and fuses. After doing this I have got to the following:

1) turn signals all work properly with the headlights/running lights off
2) with the headlights/running lights on the left turn signals work properly
3) with the headlights/running lights on the right turn signals do not flash - the rear does light up (it is dimmer than normal though) so I can manually flash them via the stalk. The front turn signal stays lit since the running lights are on anyway.
4) if it makes a difference the hazard flashers work fine.

Any more insight?

Thanks again for everyone's input! You all a great resource!

Leonard
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post #4 of 5 (permalink) Old 04-08-2019, 09:41 AM
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Reviving this thread 10 years later...

I’m having EXACTLY the problem described above. What did it turn out to be?

1976 Spider
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post #5 of 5 (permalink) Old 04-26-2019, 04:54 PM
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Things like this are overwhelmingly ground problem. Voltage seeking funny paths to ground because the intended ground has high resistance. After improving other grounds, consider adding a dedicated wire from lights to chassis where one does not exist, such as rear brake / turn signals and see what you get.

'73 GTV bare metal project... nearing 'car' status
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