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Old 08-07-2019
schamp schamp is offline
Senior Member
Join Date: Nov 2012
Location: Pine Mountain
Posts: 382

There are stories on the internet about changing from a DDEC 1 to a DDEC 2. Might be worth the google search.
Spencer Champion
Pine Mountain, Georgia
2004 M380 Was OCBIRD (sold)
1990 PT-40 Blue Thunder
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Old 2 Weeks Ago
jdgange jdgange is offline
Junior Member
Join Date: Jun 2014
Location: Yakima
Posts: 6
Default Problem resolved


Thanks for all the tips and advice. After calling around, the best deal was still a bit much but I felt I had no choice.

Before I started looking for a box, I thought I should pull the eprom and copy it (yes, believe it or not I have a reader/burner still!). I pulled the prom and found the numbers on it didn't match anything out there. Must be a special made for DDEC. I reseated it and put the cover back on.

There was so much talk about grounding to the DDEC causing issues that I dropped the leveling jack and blocked the front up and crawled back under the drivers tire to check out the connection to the ATEC. There is a wire coming out of the bundle that goes to a screw on the body sheet metal. I went to check how tight this was and the wire fell out of the ring terminal. Corrosion had done its job.

I cut the wire and crimped a new ring on and ran a new sheet metal screw through it and was very happy to see my fault indicators for the DDEC and ATEC had disappeared!!!!!

Very happy!

John Gange
Yakima, Washington
1988 WB40PT
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Old 2 Weeks Ago
Alfa Alfa is offline
Senior Member
Join Date: May 2015
Location: Austin
Posts: 605

That is great news. Glad you are back running.

Originally Posted by jdgange View Post

Thanks for all the tips and advice. After calling around, the best deal was still a bit much but I felt I had no choice.
The best deal for what? A new ECM?

Did you write down the EEPROM part number or take a picture? I have a couple of clients with old aviation stock that might have some older parts lying around.

Diego Alfarache
Austin, Texas
1988 WB40
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Old 2 Weeks Ago
dennis hight dennis hight is offline
Senior Member
Join Date: Aug 2009
Location: mancos co.
Posts: 461

What a relief when something major turns into something minor
Dennis&Debbie Hight 91 wb mancos co.
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