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Old 06-03-2012, 08:14 PM
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Turn Signal lights not working only when engine is running.

93 Mercury Topaz. The turn signal lights are not working when the engine is running. They work fine when I leave the keys in the ignition without the engine running. What could be wrong?

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Old 06-04-2012, 06:11 AM
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If you find the flasher unit and the +12 v hot wire feeding into it using a $6 light pen with a pointed end+ ( and a clip for the -ve end to chassis) turn the key to accessories and then start the engine with the 12v light probe still connected to the hot wire. If the light goes out you will need to follow that wire back to its power source by probing the wire with the sharp point of the light pen. Power should come from the fuse panel to the flasher unit with ignition on then travel to the indicator stalk to be switched left or right by the stalk. If the fuse blows you have a short , if it does not then you have a power drain with engine running. Check headlights for dim light. Alternator ok?? 14v approx.
Hope this gets you started.
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