hjgtrucking Posted 7 hours ago Share Posted 7 hours ago I have 05 CHN 613 that we are trying to diagnose a electrical issue. Currently when you turn the truck on with no air pressure the brake lights come on but on this one the lights are not working. We have replaced some of the pressure switches under the dashboard by the clutch but so far nothing has fixed the issue. Does anyone have any recommmendations? Quote Link to comment https://www.bigmacktrucks.com/topic/75468-brake-lights-when-no-air-pressure/ Share on other sites More sharing options...
Joey Mack Posted 5 hours ago Share Posted 5 hours ago Is there a pressure switch under the hood near the tractor protection valve. The switch that controls that function of the lights staying on untill air pressure is above tractor protection, is a normally closed switch. Any chance you installed a normally open switch by mistake? Quote Link to comment https://www.bigmacktrucks.com/topic/75468-brake-lights-when-no-air-pressure/#findComment-574776 Share on other sites More sharing options...
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