Trevor1978 Posted May 22, 2017 Share Posted May 22, 2017 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. Quote Link to comment https://www.bigmacktrucks.com/topic/49924-1978-mack-r685st-turn-signals-not-working/ Share on other sites More sharing options...
Trevor1978 Posted May 23, 2017 Author Share Posted May 23, 2017 Anyone? Quote Link to comment https://www.bigmacktrucks.com/topic/49924-1978-mack-r685st-turn-signals-not-working/#findComment-370565 Share on other sites More sharing options...
HarryS Posted May 23, 2017 Share Posted May 23, 2017 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. Quote Link to comment https://www.bigmacktrucks.com/topic/49924-1978-mack-r685st-turn-signals-not-working/#findComment-370567 Share on other sites More sharing options...
Trevor1978 Posted May 23, 2017 Author Share Posted May 23, 2017 Ok thank you I will see what I can find Quote Link to comment https://www.bigmacktrucks.com/topic/49924-1978-mack-r685st-turn-signals-not-working/#findComment-370570 Share on other sites More sharing options...
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