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I called Leo and he doesn't have the software for these. I would be forced to go to W.W. Williams in Phoenix and plead my case that they forgot to program/enable the jakes signal out when they rebuilt the ECM for the previous owner. Yeah, Long shot....

Is there any paperwork from when the ECM was installed? You might be able to get them to do it, or they may at least help you out on the $$ to do it. Would be worth a call. I am wondering if the jakes were added and not originally on the engine, because they would program the new ECM according to the original build specs.