Noble1 Posted September 18, 2022 Share Posted September 18, 2022 Have a 2012 CXU had a 3 pedal auto shift that was constant problems. swapped it out for a 13sp. truck will not start cause it is looking for a nuetral switch or something with the old trans. What is the best way and proper way to fix this and make it run? Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/ Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 I am proud of you for replacing the tranny, and making it more of a real truck.. I was wondering if fuse 71 in the EPDM was removed, if it would allow the truck to crank. does the starter turn the engine over? or do nothing.. I have an idea...... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509719 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 Welcome to the Dog House ! Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509720 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 (edited) Thanks. We have 4 Mack’s on our Farm. The old CH s we have a good old trucks. This CXU is nice but troublesome. I did not pull that fuse, I will and see what happens it doesn’t crank at all. Edited September 18, 2022 by Noble1 Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509732 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 Have you tried to jump power to the positive on the starter celenoid at the starter? it should be a 39MT, which has a small celenoid, bolted to it. there will be a red ring around the pos. wire. turn the key to 'on' and try it.. Please be sure to be in neutral,, sorry, I had to say it.. If it cranks, then probably a software issue, and You can just put a starter button in it.. I did this to a deleted '09 CXU, a few years ago.. It too was a farm truck, and the farmer was cool with my repair.. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509733 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 What kind of software does it take to hookup and change the onboard computer? I assume you have to tell it it has a manual trans along with other changes. I will try jumping the starter after pulling that fuse first Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509734 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 Premium Tech Tool... To me is the best.. Try to jump it, if it works and you test drive the truck without issues, you can just leave it as is.. Be sure to put about a 25 amp fuse in the starter button circuit. You can use one of the 'Key Power' posts under the top panel on the dash.. it can easily be a clean installation that is hidden,, keep in touch, and when you get it fixed, let us 'all' know. It helps other later on.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509735 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 I forgot to ask if you know where fuse 71 is? Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509736 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 No where is fuse 71? Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509750 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 In the E.P.D.M. the little fuse panel behind the clutch pedal. let me know if the legend is still in the plastic pouch, If not I will P.M. you a copy. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509751 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 No legend. do you know what number is fuse 71? Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509752 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 the numbers are printed in the fuse board, you gotta look close. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509753 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 I'm sorry. the fuse is in the top panel. here is both legends. left one is EPDM/ right one is top panel jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509754 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 Well there was no fuse in F71. not sure how that is. doesn’t look like there ever was. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509756 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 did you look in the top panel on the dash? I mistakenly said it was in the EPDM.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509757 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 There isn’t one on the EPDM either for the trans I think that’s why this truck was bought cause there were issues. I will try the starter trick. And see if it fires. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509760 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 Yea Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509761 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 so you didnt see the fuse in the panel on top of the dash where the C.B. goes? Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509763 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 just saw the picture.. Im sorry bud,, Im at a loss.. try the starter switch idea.. to test it you can just use a jumper wire, leave the key on.. let me know.. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509764 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 It runs when you jumper the starter. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509767 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 well, if the test drive is good, I would just put the starter button in it with a 25 amp fuse.. like I said earlier, you can do a clean job, and use a power post, in the top fuse panel.. just use one that powers up with the key.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509768 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 sure does idle high.. should be around 650.. glad its running... Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509769 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 I had my foot on the throttle Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509770 Share on other sites More sharing options...
Noble1 Posted September 18, 2022 Author Share Posted September 18, 2022 Now my Speedo is no worky. will have to dig into that some day. imagine it got its data from the other trans or something. Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509771 Share on other sites More sharing options...
Joey Mack Posted September 18, 2022 Share Posted September 18, 2022 highly likely.... you work quick.. 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/70452-trans-swap-issues/#findComment-509772 Share on other sites More sharing options...
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