AtlanticCartage Posted June 16 Share Posted June 16 I've got an electrical issue that's got me stumped, please see attached video, but in short I lose power to my passenger window, door lock, and a spare switch on the dash when I set the air brakes. When I release them, I get power back to those 3 switches. Any thoughts on this? Thanks! -Pat Quote Link to comment https://www.bigmacktrucks.com/topic/75678-electrical-short-off-the-air-brake-dilemma/ Share on other sites More sharing options...
T-Mack1 Posted 5 hours ago Share Posted 5 hours ago Not sure I can answer but what I see...... You have a bunch of optional switches (Key and Battery icons). And some kind of red thing. Key icons should be working with IGN on, and the Battery icons work directly off the battery. Is this a new issue??? When you pull what would be the yellow knob, a dash Park brake light should come on. Does it?? And, the center switch on the center row looks like it's ON in the OFF position (could be a camera angle thing though. Is that ON?? Is there some kind of interlock for the Body that might be affecting things? What's in the dash is an optional wiring harness (called an Overlay at the factory) for the optional switches that the body builder and or dealer hooks up stuff to. The switch connectors on the back side of the panel all fit on any switch with only a few exceptions. The top two connections on the switches is the power for dash illumination for the icons. It's odd that those 2 switch icons go out. And there may be a overlay for the dash switch/lock switches too. Also, the overlays have small connectors for the icon illumination (just saying so you understand that those connectors might be plugged in wrong) I would pull the dash panel off and check the labels on the switch connectors. It can be a spaghetti of wiring behind there. Good luck. (Note: I work from 2011 to 2016 at the factory and was Flex-repair on the cab line for 3 1/2 of those years) Quote Link to comment https://www.bigmacktrucks.com/topic/75678-electrical-short-off-the-air-brake-dilemma/#findComment-579091 Share on other sites More sharing options...
Joey Mack Posted 3 hours ago Share Posted 3 hours ago Check all of the gray wires at the connections, above the pedals and below the fuse panel in the dash, and out on the firewall in the engine bay.. they are the grounds.. Volvo got this right by making the grounds one color.. Quote Link to comment https://www.bigmacktrucks.com/topic/75678-electrical-short-off-the-air-brake-dilemma/#findComment-579104 Share on other sites More sharing options...
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