Mci 102c3 6v92TA Mechanical no power main switch

[Dave5Cs]

On the passengers side on the transmission you will have the neutral switch which has two wires going to it. Take a paperclip or jump wire and jump those teo wires and see if it will start then. That would mean your neutral switch needs replaced or the rely in the top of driver side rear fuse box is not good. There should be a ice cube rely in the front fuse panel at heater fuse. That is the same as start rely fuse and can move it to the rear to see if that lets it start.

[Jcparmley]

I am able to start the bus with a button connected directly to the starter.  I just don't have power up at the dash on the main switch.  Could the neutral switch interrupt power to the main switch? 

On the passengers side on the transmission you will have the neutral switch which has two wires going to it. Take a paperclip or jump wire and jump those teo wires and see if it will start then. That would mean your neutral switch needs replaced or the rely in the top of driver side rear fuse box is not good. There should be a ice cube rely in the front fuse panel at heater fuse. That is the same as start rely fuse and can move it to the rear to see if that lets it start.

[thomasinnv]

I am able to start the bus with a button connected directly to the starter.  I just don't have power up at the dash on the main switch.  Could the neutral switch interrupt power to the main switch?

No the neutral switch will not interrupt power to the main switch.

[Dave5Cs]

But it will from the go switch to the starter.

[thomasinnv]

But it will from the go switch to the starter.

Yes but if I understand correctly the OP problem is he has no power at all to the dash.

[Jcparmley]

Yes, that is correct.  I don't have any power to the dash. 

Yes but if I understand correctly the OP problem is he has no power at all to the dash.

[Van]

Yes, that is correct.  I don't have any power to the dash.

Power at both sides of batt disconect? Main breaker tripped? Power @t the dash switch? Should be easy to troubleshoot with a simple Volt meter.

[chessie4905]

even simpler, start with a 12 or 24 volt test light. may have a circuit breaker that went bad. btw, Harbor Freight sells a package of 3. a 12volt test light, a 24 volt test light, and a continuity tester for like 7 bucks. can't afford to pass that up. Centech brand.

[Jcparmley]

Yes, I have power at both sides of the battery disconnect.  I can't seem to find the main breaker.  The first bay on drivers side has a breaker panel but there is no breaker in the spot that says "main breaker"  (see photo)  I have no power at the dash or dash switch.  I do not have power at the rear control panel next to the engine.  I do have power at the main relay under the drivers window.

Power at both sides of batt disconect? Main breaker tripped? Power @t the dash switch? Should be easy to troubleshoot with a simple Volt meter.

[Bill Gerrie]

Power at main relay. Take cover off and actuate the relay. What happens then? Some you ground the coil and some you give voltage to. TRY momentarily Either way. Nothing to lose.

[Jcparmley]

My old relay would only work when I manually actuated it.  So I removed it and put a new one in.  I will take the cover off and see if I can manually actuate that one as well. 

Power at main relay. Take cover off and actuate the relay. What happens then? Some you ground the coil and some you give voltage to. TRY momentarily Either way. Nothing to lose.

[luvrbus]

Check the connection (big cable) on the back of the alternator and tell us what the voltage is or if you even have power there,the wiring goes through the engine rail to a bus bar from the rear panel to power the dash on a C it makes a loop on Tom's model C.there is also a ground wire on the passenger's side by the starter if that gets broken nothing works lol only took a 1/2 of day to figure that out       

[Jcparmley]

ok, I am back to trying to figure out this electrical problem.  I still have no power to the master power switch on the dash and therefore can not start the bus from the dash.  I can start the bus by installing a button on the starter itself.  I can also turn the engine off by pushing the lever on top of the throttle body.  I removed the air line to the engine shut off cylinder and capped it temporarily because it would shut down the engine once the air was built up.  I will check the big cable on the back of the alternator for power and get back to you all.  Thanks for the help.

Check the connection (big cable) on the back of the alternator and tell us what the voltage is or if you even have power there,the wiring goes through the engine rail to a bus bar from the rear panel to power the dash on a C it makes a loop on Tom's model C.there is also a ground wire on the passenger's side by the starter if that gets broken nothing works lol only took a 1/2 of day to figure that out     

[Jcparmley]

I hooked up the button and the bus starts right up.

Hook up a push button start button to the starter to see if it starts without all the stuff between the start switch and the starter,

[Jcparmley]

Calling all experts in electrical stuff.  Please help me figure this out.  I need to get this bus moving again.  Thanks