macattack Posted December 12, 2011 Share Posted December 12, 2011 got either a trans problem or electrical issue. this is what happens. when i put my truck in drive the truck dies. i also have no reverse. no backup lites, alrm, camera etc....when sitting idling there seems to be a slight misfire, when the misfire happens my reverse lites, camera etc... flash momentarily and the driveshaft looks like it wants to turn.i found 1 of the 5 circuit breakers were tripped. i reset it and tried again, but still nothing. i found 2 relays one for neutral the other for reverse, as soon as the part store opens i am gonna try replacing those relays and see what happens. i replaced the filters and cleaned the breather. oil looks great and there are no funny noises.i also found a silver box under the dash that looks like either a voltage reg or ign module?. would anybody have an idea of what is going on?thanks Quote Link to comment https://www.bigmacktrucks.com/topic/22080-wire-diagram-for-mr688s-needed/ Share on other sites More sharing options...
shortstack Posted December 12, 2011 Share Posted December 12, 2011 Sounds like short to me or maybe water got in something shorting it out but hard to say. Trey Quote Link to comment https://www.bigmacktrucks.com/topic/22080-wire-diagram-for-mr688s-needed/#findComment-93828 Share on other sites More sharing options...
macattack Posted December 12, 2011 Author Share Posted December 12, 2011 yah she is a tough one. i replaced the 2 relays and it didnt help. i took off the linkage to make sure everything was good and it all checked out. i even shifted it by hand at the trans and still nothing.one mechanic told me the torque converter is locked up, i guess a nice way of saying shes F*cked.anyone have a ht740rs for sale? Quote Link to comment https://www.bigmacktrucks.com/topic/22080-wire-diagram-for-mr688s-needed/#findComment-93858 Share on other sites More sharing options...
macattack Posted December 21, 2016 Author Share Posted December 21, 2016 fixed it. air modulator valve was bitched. need to keep a extra in cab just in case. Quote Link to comment https://www.bigmacktrucks.com/topic/22080-wire-diagram-for-mr688s-needed/#findComment-355706 Share on other sites More sharing options...
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