Mavman Posted May 13, 2016 Share Posted May 13, 2016 Working on the engine brake and can not find a wiring diagram for the relays and what connected beteen vecu and engine ecu please help Quote Link to comment https://www.bigmacktrucks.com/topic/45209-really-lost/ Share on other sites More sharing options...
fjh Posted May 14, 2016 Share Posted May 14, 2016 I think you will find the ecu runs the engine brake directly on this era of truck! no relays! Is there power showing up at the valve cover? also some newer stuff didn't let the brake work till oil temp reached 150 ! Quote Link to comment https://www.bigmacktrucks.com/topic/45209-really-lost/#findComment-333253 Share on other sites More sharing options...
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