I am having a problem with the turn signal / hazards on my 1986 560SL. I realize that this topic has been addressed at length, but I have not been able to figure this one out - Here is the situation:
1. Front turn signals work fine when headlights are off, but not when the headlights are on
2. Turn signals in rear work fine regardless of headlights on/off
3 Hazard lights do not flash any time
4. I do get a circuit warning light on the dash when trying to use the turn signals with headlights off
5. I have replaced the hazard switch as I thought it would be the culprit - no luck

Might this be the flasher that I understand is located behind the left speaker in the dash? If so, why would the turn signals flash when headlights are off?

Any advice or suggestions would be helpful. Thanks.