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1978 Mack R685ST turn signals not working

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I have a 1978 Mack R685ST and the turn signals do not work. When I turn the headlights on the headlights dont come on but the side marker lights do and so does the tail lights. I am lost and do not know what to look for any help would be nice.

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I would check the grounds and circuit breakers. In some cases the headlight switch has a built in circuit breaker. On my B model I had to use a separate ground wire for the front turn signals as they would not ground through the paint.

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