Bobcat 864 no voltage

[vincehay]

Hoping you guys can offer up some ideas: 2001 Bobcat 864 G Series (Triangle Headlights, if that makes a difference) The machine was running fine, when a main hose failed. During the repair, the cage was up for a couple weeks, while we were waiting on parts to arrive and doing some maintenance on the foot controls and such. We got the hoses made up, installed and when we go to fire up the machine, there is no voltage to the panel where the key switch is. The machine will fire off and run fine, when jumping the starter, so I know the battery is still capable. We have removed both the Left side gauge panel, as well as the key switch panel to check for corrosion or moisture in those. There was some, we dried it out, and noticed no corrosion or anything out of the ordinary. Still no lights or any indication of power to the key. We removed the key switch, tested it, and all was fine. I do have the service manual with wiring diagram, but it's limited in the sense that many of the wires show going in/out of the computer but don't indicate if they are supposed to be carrying voltage or not. In the fuse panel, we have tried swapping relay's around, no difference. When turning the key, I can hear one relay, moving, but none of the lights, or gauges move or any indication of any power going to the panel at all. Can anyone suggest a specific wire I should trace? Or a possible cause for this? We are out of troubleshooting ideas. Thanks!

 

[antfarmer2]

On my 743 when I pick up the cab it will unplug a wire harness

 

[7LBSSMALLIE]

On my 743 when I pick up the cab it will unplug a wire harness

panels are fired by pink white I have previous threads on this. comes outa controller to lh panel branches to right. degrades over time will show twelve but wont carry the load. easy test . but you will need a schematic to ensure youre doing it right . what yore gonna do is backfeed twelve volts to lh panel a jumper from batt to pwr in on lh. panel. this is one of those don't screw up. or youre smoking stuff . not all those panel pin will accept 12 volts. . another thought is to examine controller if its still got a snap together lid ( VERSUS THE POTTED) which is poured black stuff. I would probally replace controller. it will need programed. you stadeted its sat for a while there is a direct correlation between low batt volts and smoked controlers. what the engiereies say I could care less , those of us in trenches, have seen to many times to be discounted.

 

[7LBSSMALLIE]

panels are fired by pink white I have previous threads on this. comes outa controller to lh panel branches to right. degrades over time will show twelve but wont carry the load. easy test . but you will need a schematic to ensure youre doing it right . what yore gonna do is backfeed twelve volts to lh panel a jumper from batt to pwr in on lh. panel. this is one of those don't screw up. or youre smoking stuff . not all those panel pin will accept 12 volts. . another thought is to examine controller if its still got a snap together lid ( VERSUS THE POTTED) which is poured black stuff. I would probally replace controller. it will need programed. you stadeted its sat for a while there is a direct correlation between low batt volts and smoked controlers. what the engiereies say I could care less , those of us in trenches, have seen to many times to be discounted.

our genral theory on this is. low volts create hi amp draw resulting in heat therefore breakin down these little itty bitty wires in controller and pwr supply wires. probally looks good on paper , but real world not so much.

 

[vincehay]

our genral theory on this is. low volts create hi amp draw resulting in heat therefore breakin down these little itty bitty wires in controller and pwr supply wires. probally looks good on paper , but real world not so much.

This is all good advice...thanks for the tips...I will let you know how it turns out.

 

[antfarmer2]

This is all good advice...thanks for the tips...I will let you know how it turns out.

Did you pull check and clean all fuses and relays in the box and check the back of the box connections if possible .......does this one have the big fuse by the battery?

 

[antfarmer2]

Did you pull check and clean all fuses and relays in the box and check the back of the box connections if possible .......does this one have the big fuse by the battery?

My money still thinks you pulled a wire lifting the cab

 

[vincehay]

My money still thinks you pulled a wire lifting the cab

No big fuse by the battery.....the fuse/relay box is actually pretty clean and in good shape. I will try pulling all of the relay's checking for good connection and such. I am starting with the hot wire going to the key switch and seeing where that ends up down below. THANKS.