2010 Blue Bird A3FE3007 Super Ground Short

This topic contains 5 replies and was last updated by nathan-bisel 8 years 6 months ago
Author
nathan-bisel
October 31st, 2012 10:53am
Post
I am a contractor mechanic out in Afghanistan and a 8 year Army vet, having worked on several military vehicles and now in transgression to Civilian motor vehicles. Has anyone ever come across an issue such as the following: The body is being charged, the lower half of the under body fuse panel is inop. Yet the bus still runs and operates as normal. Furthermore the rear emergency exit red light stays on constantly while the lights are on only. The rear exit buzzer and switches are inop but receiving power. My lead mechanic and I have spent 2 days troubleshooting and trying to figure this out. On the same note we noticed that there could be a major short to ground, due to when you hook up the main ground connectors either the dash will flicker or the lights will flicker depending on which one you touch to the battery. We have gone through countless electrical diagrams and have attempted to find the cause of this. A bit more background history, the Air Force Operators have been jumping the starter with a screwdriver in order to get the vehicle running for some time and never brought it in to get the vehicle checked out. We are just trying to figure out what could be causing this or if anyone has ran into this type of issue before?



Sincerely



Nate Bisel

Mechanic

DynCorp

Afghanistan
doug-niemi
October 31st, 2012 8:01pm
Without having the body and serial numbers it would be difficult to look up wiring diagrams. It sound like you have multiple electrical issues going on. I wouldn't be jumping the dash or lights as a diagnostic evaluation. You may have multiple shorts and they can be either to ground or power based on the symptoms you are describing.



Honestly I would break down the problems to individual issues and address them one by one. I would start with the "The body is being charged, the lower half of the under body fuse panel is inop" and start at your body control solenoids in the outside electrical panel. It sounds like one is working and one is not, which is how you would get half the things working and the other half not. As you address these issues systematically, you will probably find that one or more of your issues if not all maybe straightened out in short order. Let us know how it goes. Repost if you have more questions. Good luck...
nathan-bisel
November 1st, 2012 3:02am
Doug thanks for the insight. I have already gone to http://service.blue-bird.com/WiringSchematics/ and used their wiring schematics but to no avail. I have a few other things I am going to try out and go from there. But I will say I am not jumping the dash or the lights. I was just saying that when you reconnect the batteries on the ground side that either the dash will flicker or the lights will flicker depending on which one is connected at that moment. Meaning that I can dissconnect the ground cables and then when reconnecting one or the other, that will occur. I wouldn't intentionally attempt to jump the lights nor the dash. Since both of those are working fine to some extent. Thank your for the info.
ron-maizis
November 2nd, 2012 1:24am
Nathan...... there is a gent on this forum named John Waylen, AKA "The School Bus Mechanic". I recommend you try to contact him. He has yrs of exp on Buses.....a guru of sorts. He may be able to help as he has years of experience in diagnosing these weird electrical issues on buses.
nathan-bisel
November 2nd, 2012 4:08am


Ron wrote:

Nathan...... there is a gent on this forum named John Waylen, AKA "The School Bus Mechanic". I recommend you try to contact him. He has yrs of exp on Buses.....a guru of sorts. He may be able to help as he has years of experience in diagnosing these weird electrical issues on buses.




Thank you Ron will do what I can. I have however got alot of the issues fixed. Minus the buzzer and under body fuse panel. Seems the slightest things will set these Blue Birds into a frenzy.
ron-maizis
November 2nd, 2012 3:49pm
That's good to hear, keep him in mind for future reference. He is one of the top Bus techs in North America.

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