ultratruck Posted May 22, 2014 Share Posted May 22, 2014 (edited) I have a 2001 rd688s that shuts off going down the road. I have traced it to what I think is a relay getting hot. There are 2 relays in the glove compartment that get to around 150 or 160 and then one clicks and the truck shuts off. It is not the ignition relay that clicks. I have cleaned the starter to frame and frame to the block grounds and ran a new one also. I replaced the relays also. Any ideas would be great. After working on it some more I am not sure it is the relay shutting it of because the power and ground do not change after it shuts off only after the motor quits turning over. Edited May 22, 2014 by ultratruck Quote Link to comment https://www.bigmacktrucks.com/topic/35799-rd688s-relay-problem/ Share on other sites More sharing options...
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