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BMC (Bluebird Motor Coach Unique Issues) If you have a unique issue with your BMC coach and it can't be answered in one of the other forums here, then this is where you can list it.....List your BMC Parts here too.

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  #11  
Old 02-07-2020
dthollis dthollis is offline
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According to drawings I have, the frame mounted solenoid is downstream from the Allison TCU and VIM. If your shifter pad screen is blank, it isn't receiving power or has an internal failure.

You didn't disconnect engine batteries and maybe miss replacing one of the small wires? That's the first thing Ted at TKT had me check when I had a blank screen. Turns out my Allison TCU was fried, but no power to it would result in the same blank screen and possible no crank.

I think there are also a couple of fuses inside the VIM box to check. It's right at top center in my compartment right below driver's window. Flat cover about 6"x6".
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1994 BMC37
1991 SP36(sold)
1984 FC35(totaled)
1978 FC33(sold)
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  #12  
Old 02-07-2020
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Maybe check the battery connections and battery grounds
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  #13  
Old 02-07-2020
Harold,Cat&Sam Harold,Cat&Sam is offline
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Mr David is correct . In the access panel under the drivers window , you need to check the voltage to the Allison box . Inside that box is a couple of relays and fuses if i remember correctly .

First thing to know is whether or not you have power on that 10 gauge red wire .If I remember correctly , It gets power directly from the battery .
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  #14  
Old 02-07-2020
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I assume the safety switch in the engine bay on the passenger side accessible from the rear engine hatch is on. The same panel has the engine bay light switch.
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  #15  
Old 02-08-2020
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Does a BMC have a A/T switch? If so did you bump it?

That switch stops the bus from starting by cutting power to the Neutral Safety Relay. The Neutral Safety Relay is what allows the Starter Relay to pick-up which then picks-up the Starter Solenoid. At least that how it was wired on my 95 WB, and looks to be the same on my 2000.
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  #16  
Old 02-08-2020
Harold,Cat&Sam Harold,Cat&Sam is offline
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The 94 BMC didn't have an A/T switch , at least not one that I was aware of . I don't know about a 95.... Somewhat different animal as far as dash and switches

If he has lost power to the transmission touch pad , it's not going to start .

On ours , I would turn the key on and wait until I heard the relays in the Allison box click a few times and then it would start . If I didn't hear the relays clicking , it would not start .

Mr Lee , feel free to give me a call if you have any questions .
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Sam 11 year old min schnauzer
Mooringsport, Louisiana
318-553-4186
1994 BMC 37' "Sold"
2004 Jeep Wrangler Unlimited
1986 F150
KE5WCW
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  #17  
Old 02-08-2020
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Default Relay

I don't believe I have an A/T switch either

Although I have never changed it, my notes say the part number ( I got that from someone w while back) for that rear frame rail relay is NAPA ECH ST 67. Is that correct?

Also does that relay under the driver's side window have anything to do with the transmission? I have never had to change that one either. The part number I have for that one is ECH ST 80

Thanks
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1995 BMC 37
300 HP Cummins 6CTA 8.3 Turbocharged Diesel
Boldly Going Nowhere
http://www.bbirdmaps.com/index.cfm #117
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  #18  
Old 02-08-2020
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Thanks for your tips. I will be checking on this stuff today or tomorrow (have a busy day today). Will post what I find.
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Lee - 423-292-5767 or Jacque 423-262-9569
or lnjdavis@gmail.com Please call or email instead of private messages


1995 BMC 37
300 HP Cummins 6CTA 8.3 Turbocharged Diesel
Boldly Going Nowhere
http://www.bbirdmaps.com/index.cfm #117
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  #19  
Old 02-08-2020
dthollis dthollis is offline
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Quote:
Originally Posted by Lee Davis View Post

Also does that relay under the driver's side window have anything to do with the transmission? I have never had to change that one either. The part number I have for that one is ECH ST 80

Thanks
Yes it does. Turn your key to the "on" position. Do your windshield wipers work now? If not, that solenoid is bad. ST 80 is what I replaced all 3 solenoids with on our BMC.
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1994 BMC37
1991 SP36(sold)
1984 FC35(totaled)
1978 FC33(sold)
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  #20  
Old 02-08-2020
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Lee Davis Lee Davis is offline
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Quote:
Originally Posted by dthollis View Post
Yes it does. Turn your key to the "on" position. Do your windshield wipers work now? If not, that solenoid is bad. ST 80 is what I replaced all 3 solenoids with on our BMC.
David, The windshield wipers work when the key is turned on. So I assume the solenoid under the driver's window is OK and so it must be something else?
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Lee - 423-292-5767 or Jacque 423-262-9569
or lnjdavis@gmail.com Please call or email instead of private messages


1995 BMC 37
300 HP Cummins 6CTA 8.3 Turbocharged Diesel
Boldly Going Nowhere
http://www.bbirdmaps.com/index.cfm #117
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