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Reply to "RIO GRANDE UP HERITAGE LEGACY SD70ACE 6-28377 Uncoupler Pocessed"

gunrunnerjohn posted:

Well, clarity is key when you're describing issues!  This is what you said...

Randy Owens posted:
Marty Fitzhenry posted:

Reprogram the engine with aux code 2.

I tried that already.  Interestingly enough, that worked for a short while (like an hour or two, if I remember)....  I think the next time I went to run the engine it started acting up again.  Very strange....

-Randy

I'd have to be a mind reader to know that your latest description is what is really happening.

Now that we have a clearer description of the issue, I'd do this.  First, look for ANY shorts in the wires coming from the coupler to the motherboard.  Next, install a 1uf 50V non-polarized capacitor directly across the coupler inputs on the motherboard.

Thanks, John.  My First post said this:

Rear coupler randomly opens several times a minute.  Sitting idle, there is the audible solenoid buzz and the coupler pops open.  Close it and wait a few seconds and it happens again.  

Since the engine isn't moving, I doubt its dirty pick-ups.  It'll do this underway or just sitting.  I think it's ok other then this problem, and dang, it's been a great engine until now.

What board needs to be replaced / where should I start?  I know there are a number of interconnected boards internally, but I'm not clear on which does what...

Based on that, I thought it was pretty clear what was happening.  Someone else misunderstood about it losing it's programming.  I was just trying to clarify and bring things back to my original query.

I do appreciate all the help.

I ran the engine yesterday for an hour or two, and didn't notice any erratic behavior.  However, it just stopped after that time.  Sounds were working fine, but it refused to move.  I could blow the horn and adding power increased the engine pitch accordingly (the fake diesel sound).  I tried the Aux-2 reset, but no go.  It's definitely got some issue.

-Randy

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