688mack

So wiring is checking out ok my problem must either be the speedo head or in the vecu.

99 rd688s replaced speed sensor an speedo. Speedo would sweep 0-max while sitting at red light 3-4 times but would read fine while moving. Now it doesn’t work at all will still sweep 0-max when sitting still but nothing while moving. I have noticed that needle will move when u adjust the dash lights also push the clutch in it will sweep turn headlights on it sweeps. I have found a bare wire on top of trans for speed sensor but that did nothing im in the dash now looking for bare wires now not seeing any yet. There are sings of a mouse being in there though. Does anyone happen to know the numbers an letters for wire in the speed circuit any help would be great. Also lightning bolt is on an i belive it was speed control

89 rd688s dual steering box. Looking for a line diagram. Truck was stripped to frame an put on hold for a year an the guy who took it apart has moved on an nothing was marked. Each box has 4 ports