svigarfarms Posted October 26, 2017 Share Posted October 26, 2017 Turn on signal an u get brake lights Any ideas 1 Quote Link to comment https://www.bigmacktrucks.com/topic/51507-turn-signal/ Share on other sites More sharing options...
gearhead204 Posted October 26, 2017 Share Posted October 26, 2017 on a 2 light system brake and turn use the same filament in the bulb. so the turn signal switch separates left from right by sliding a plate across deferent contacts inside the switch. that said your problem could be inside the sw. or someone could have things wired for a 4 light system and didn't do it right !! 2 light = tail low filament turn/brake high filament ........one light per side of vehicle = 2 total 4 light = one light is tail ( it gets confusing here) and circuit of choice brake or turn 4 light = second can be or not, a redundant tail, then either brake or turn ( which ever one isn't used in light one the tractor is typically wired 2 light. the 7 wire trailer plug is normally set up for a 4 lamp system. now you need to see where it goes amuck ! could be in the turn signal sw. or it could be caused by someone doing improper wiring between the two systems. will need more info on what truck this is on, maybe I can help Quote Link to comment https://www.bigmacktrucks.com/topic/51507-turn-signal/#findComment-383474 Share on other sites More sharing options...
svigarfarms Posted October 26, 2017 Author Share Posted October 26, 2017 I think it is in the switch you can make it do all kinds of wired stuff by playing with the switch Quote Link to comment https://www.bigmacktrucks.com/topic/51507-turn-signal/#findComment-383487 Share on other sites More sharing options...
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