greengiant Posted November 9, 2015 Share Posted November 9, 2015 1985 Mack R400. No brake lights or turn signals when service brake is applied. When parking brake is applied, brake lights and turn signals work perfect. I changed brake light switch under hood, checked all fuses, turn signal switch, and can find no problems with grounding. At a loss, any suggestions?Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/42580-brake-lightsturn-signals/ Share on other sites More sharing options...
gearhead204 Posted November 10, 2015 Share Posted November 10, 2015 do you know if the new switch is a good one? is it a normally open or normally closed switch or could it have been a low air pressure sw. Quote Link to comment https://www.bigmacktrucks.com/topic/42580-brake-lightsturn-signals/#findComment-310750 Share on other sites More sharing options...
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