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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #31  
Old 09-03-2019
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jcs707 jcs707 is offline
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If the starting circuit logic is similar to that of the S60/Allison, you should have a Neutral Safety relay which controls power to the starter relays.

If that's the case, find the Neutral Safety relay and check if you have good ground on PIN 85 with the IGN in the START position. If you do, then the Allison ECU/VIM may actually be ok (i.e., the ground comes from the Allison VIM).

Chk that you have +12vdc on PIN 86 - still with IGN in the START position. If you have +12vdc on PIN 86 and 0vdc on PIN 85 you have the correct voltage drop across the control circuit of the Neutral Safety relay.

If those check good, then check if you have +12vdc on PIN 30 and PIN 87 of Neutral Safety relay. Voltage output from PIN 87 goes to the starter relay/solenoid.

If no power on PIN 30 then check the rear start box switch.

Again, not sure how the start circuit login works on a BMC, but I would think it would be similar to other birds built in the same time frame.
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Last edited by jcs707; 09-03-2019 at 06:18 PM.
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  #32  
Old 09-03-2019
dthollis dthollis is offline
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Our 1994 BMC engine started with no problem, but the shifter windows were dark and the "do not shift" light was illuminated. Ted Keating at TKT did troubleshooting over the phone, and since we were stranded and only about 3 hours from his shop we drove to him in the car. He tested our Allison computer, pronounced its power supply dead, and programmed a rebuilt one and had us on our way in 30 minutes for $1000 exchange. That was 2016. Happy then and all still well.

I have a friend that also has a 1994 BMC that had a bad Allison computer as well. He had his redone by the guy in Texas for $500. Last I heard he was satisfied.

Ted explained to me that it isn't a matter of "if" but a matter of "when" these computers quit and leave you stranded. It was a blessing in disguise that ours quit literally 5 minutes after handing over the check to the sellers. The sellers felt bad and ponied up half of the money and we have a "rebuilt" instead of an "unknown" Allison computer.
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1994 BMC37
1991 SP36(sold)
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  #33  
Old 09-03-2019
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Mike Hohnstein Mike Hohnstein is online now
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that's good information, I'll be sure keep my spare ecu in the upper compartment, even tho it's only prgrmd for 5sp.
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  #34  
Old 09-03-2019
LeRoy LeRoy is offline
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I spoke with the guys from transmission instruments in Texas. It appears the ecu is dead and I overnighted it to them. He did say that if the Allison ecu dies the engine will not start. I guess all we can do is wait now.
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1995 BMC 37 “MockingBird”
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  #35  
Old 09-03-2019
Harold,Cat&Sam Harold,Cat&Sam is offline
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Hope everything works out ok .
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Sam 10 year old min schnauzer
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1994 BMC 37' "Sold"
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  #36  
Old 09-04-2019
LeRoy LeRoy is offline
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Today’s update. The original unit is headed to Tx for repairs and we have located another that will be delivered to Fargo in the morning. The shop there is going to program it and hopefully we’ll be moving tomorrow. Fingers crossed!
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  #37  
Old 09-04-2019
Marty Gregg Marty Gregg is offline
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A replacement from Ted should have the updated SIN number and he will program the downshift for the pack-brake. I had to replace mine a few years ago.
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  #38  
Old 09-06-2019
LeRoy LeRoy is offline
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The Mockingbird is flying again. The guys in Tx came through for us in just three days. Of course that was about 300 dollars in overnight air fees, but it was cutting into our vacation! I learned a couple of things. The trans computer loosing power feels like your engine just shut off. The speedo drops to 0 and the shifter is dark. Fortunately ours came back on four times allowing us to get off onto an outer road. If the Allison isn’t working neither is the engine. So don’t shut it off if you still need air. Also a new $3000 one from a dealer doesn’t have the shifter on it, that is another $2300 if they can find one which ours couldn’t. I discovered that after going to pick one up. The new problem now is the pacbrake is not engaging. Supposedly they didn’t change the configuration so I will have to see if the ecu is getting 12v on the pac input wire next. That’s tomorrow’s problem though.
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  #39  
Old 09-06-2019
badandy badandy is offline
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I think I need to start repairing these things. $1000 is rubbery. Glad you got going though!
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  #40  
Old 09-07-2019
Harold,Cat&Sam Harold,Cat&Sam is offline
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Happy Motoring
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Sam 10 year old min schnauzer
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1994 BMC 37' "Sold"
2004 Jeep Wrangler Unlimited
1986 F150
KE5WCW
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