SOLVED !! Stranded 93' MCI 12 6v92 DDEC3 Wont Start

[blue_goose]

Be sure that the lights come on and then go off.  If the check engine or stop engine stay on let us know.
Jack

[Beachfinn]

Thank you all. I'll start with the check engine etc lights. I'll post findings after I find someone to open the gate to the shop.

[Beachfinn]

Ok, at the bus; there is no check engine light on the instrument cluster. I have a tiny air compressor hooked up to the Schroeder valve in engine side door to air up.
Checked ddec fuses in battery compartment; all good. Measured voltage when cranking and 12v drops to ~9. Hooked up to pickup truck to try to get a better charge in...

Any other ideas? I'll try to crank after a little while and see if 12v stays higher...

[scott332]

Are the switches in the back set to front start? The check engine light should be on when the step light switch is on and the master switch is on. It should stay lit when the alarms are ringing in the front for low air.

[Beachfinn]

Switches in the back are set to front start and run position, the instrument cluster doesn't seem to have a check engine light.....and on another note there is no low air buzzer sounding, even though air is still at 72.

[blue_goose]

The MC 12 has a check and stop engine light.  They more than likely are not coming on.  They will come on each time you turn the switch on and only stay on for a few seconds.  If these lights don't come on don't wast your time trying to start the engine.
Jack

[scott332]

On mine the stop engine light is on the bottom row of indicator lights 3 rd from left, check engine light bottom row 4 th from left. Those both should come on when the switch is first turned on. Try borrowing bulbs temporarily from another position.

[Beachfinn]

https://db.tt/nm1BFmt1
Here's a link to the Dropbox picture of the instrument light cluster. What am I missing?

[Beachfinn]

Checked the 3rd and 4th bottom row from the left bulbs, both are working but not illuminating.

[scott332]

Your bottom row is not the same as mine. Are you sure the welders didn't weld on the bus? Most welders know to unplug engine computers, but some don't bother, taking the chance nothing will go wrong.

[scott332]

Try turning on the master switch, and switching on the engine override three times ( it's a momentary switch). Without hitting the engine start.  On mine the stop engine light and check engine lights will flash computer error codes. If any lights flash, count the flashes between the pauses. Write the flashes down if anything does. They will repeat until you switch the override once more.

[blue_goose]

If you would like to call I may be able to help.  863-2063-3838
Jack

[robertglines1]

you said 9 volt to ddec... it shuts itself off below 11.6 volts.. Bad battery? one bad cell can do it. Below 11.6 it does not talk to injectors. can spin but without injectors has no fuel. ck your batt individually chances are the low batt is the one that feeds ddec

[eagle19952]

what Robert said ... keep charging and stop cranking... a low battery can kill more stuff than most can afford ...

[luvrbus]

With a low or bad battery he should be getting a code 61