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Old 04-11-2022, 08:37 AM   #81
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Hello Old Smokey, Can you share the process you went thru for adding this switch? I have a 2015 37FS. I have the OD button already but it sounds like this does not activate the performence mode in the tranny. I appreciate the help here!
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Old 04-11-2022, 08:54 AM   #82
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Yes. I installed a control wire in pin location 42, ran the wire through the firewall into the cab, connected it to a single throw, single pole toggle switch, and connected a control switch to a signal source. Pin 42 is vacant and filled with a plastic dummy plug like many of the unused pin locations in the TCM connector.

You are correct. The O/D lock out connects to pin 61 and is independent of the mode selection function. I also have O/D lockout which was installed by Freightliner.

The Allison TCM is mounted on the drivers side firewall at the top, just under the hood. It’s very easy to access.
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Old 04-11-2022, 09:28 AM   #83
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Old Smokey do you happen to have a picture of the TCM with this wire pointed out? Just want to be armed with all the info when I get home this eve to look at mine. Maybe a pic of your switch as well if possible. I really appreciate the incite here mister!
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Old 04-15-2022, 07:55 PM   #84
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I have a 2015 HJ and had the transmission reprogrammed by Allison. I also had Cummins do the uprate. Huge difference! We will be traveling primarily in the mountains so no need for eco mode. Best $600 I ever spent. My thanks to Robbyr for the guidance. Glad yours worked our as well. Totally different machine after the changes.
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Old 04-29-2022, 03:44 PM   #85
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Added a label to my switch.
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Old 05-02-2022, 09:46 AM   #86
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Would it be possible to see the TCM wiring?
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Old 05-10-2022, 12:12 PM   #87
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Old Smokey, Is the control wire a simple keyed 12v power wire?

Thanks

Pete
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