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Old 06-19-2016, 12:49 PM   #1
petebee
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Default Left turn signal activates headlights...bad relay?

Weird symptom, when you use the left turn signal on my 93 240 it turns on the headlights and does not activate the blinker. Lights come on without the switch turned on, and won't go out until you disconnect the battery (stay illuminated when car is turned off).

Bad relay? I know there are two - one under the dash on driver side and another behind the battery (that one switches low/hi beam function I think).
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Old 06-19-2016, 12:58 PM   #2
coalminer
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The only common denominator that I know of between the headlights and the turn signals is the turn signal switch, which also houses the bright/dim switch for the headlights. This is where I would look first.....at the turn signal switch on the steering column.

Maybe others will jump in.
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Old 06-19-2016, 03:50 PM   #3
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Bad ground somewhere.
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Old 06-19-2016, 07:21 PM   #4
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That ^^. Most electrical problems with lighting on older Volvos are related directly to bad grounds. Find them, and clean them.
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Old 06-19-2016, 08:19 PM   #5
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Something is loose or broken in the lever mechanism.
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Old 06-19-2016, 09:09 PM   #6
petebee
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I am thinking that it is probably the switch. I have a backup unit but includes wiring for cruise control as well. It looks fairly easy to swap...I'll check the connectors to see if we can simply install w/o the cruise stuff (my car has no cruise control).
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Old 06-19-2016, 11:07 PM   #7
Harry Tuttle
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Quote:
Originally Posted by tiredoldtommy View Post
Bad ground somewhere.
This is likely, and easiest to check before you start throwing parts at it. There are some grounds in the LF corner that are worth looking at. Especially the ones that have multiple wires on them.
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Old 06-20-2016, 09:47 AM   #8
ZVOLV
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Yeah likely bad ground or short circuit. I had a 740 that when you honked the horn, the rear wiper would go.

Check for bad wiring up front. It degrades by the lights.
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