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Old 05-09-2019, 04:36 PM   #1
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Add OD lockout switch to 18 Seneca

I want to add the Overdrive lockout switch that Jayco opted not to have installed in my 2018 (M2) Seneca when new. I found an Allison transmission dealer near me that will make the connection as per Matt, the calibration engineer at Allison, but they are not allowed to add the switch inside the cab.

I reached out to Matt, but as someone here stated, he is no longer allowed to interact with the end user. Iím trying to figure out what type of switch to use and what gauge wire to run. The Allison tech will make the connections at the transmission if I run the wires. Seems kind of silly but I guess I understand.

Suggestions?
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Old 05-09-2019, 05:01 PM   #2
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Originally Posted by Mark S View Post
I want to add the Overdrive lockout switch that Jayco opted not to have installed in my 2018 (M2) Seneca when new. I found an Allison transmission dealer near me that will make the connection as per Matt, the calibration engineer at Allison, but they are not allowed to add the switch inside the cab.

I reached out to Matt, but as someone here stated, he is no longer allowed to interact with the end user. Iím trying to figure out what type of switch to use and what gauge wire to run. The Allison tech will make the connections at the transmission if I run the wires. Seems kind of silly but I guess I understand.

Suggestions?
Mark - My 2014 has the factory-installed switch, I could go to my unit tomorrow and pop off the dash and get the Freightliner part number off of it. I am very experienced at getting into the dash!

But I think my switch works through the vehicle's multiplexed network and talks to transmission control module (TCM). But I'm sure the switch could be made to function even without using the network. And I suspect very light gauge wiring would suffice.

If I can do this to help let me know!
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Old 05-09-2019, 06:47 PM   #3
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Originally Posted by Robbbyr View Post
Mark - My 2014 has the factory-installed switch, I could go to my unit tomorrow and pop off the dash and get the Freightliner part number off of it. I am very experienced at getting into the dash!

But I think my switch works through the vehicle's multiplexed network and talks to transmission control module (TCM). But I'm sure the switch could be made to function even without using the network. And I suspect very light gauge wiring would suffice.

If I can do this to help let me know!
You can... but as Robbbbbbbbbbby sez,(pun intended) our switch is muliplexed. It should go thru the TCM to properly work and the switch is a standard Freightliner switch that plugs into one of the spare connectors behind the dash.
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Old 05-09-2019, 07:47 PM   #4
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Ok, guys, after reading this and speaking to Slow Poke I am going to visit my Freightliner dealer and see what they say. Thanks guys.

And Rob, thanks for the offer but Steve had photos available and texted them to me.

Thank you both.
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Old 05-10-2019, 08:14 AM   #5
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This is interesting. Following closely. I have just made a deal on a new early 2018 Seneca but have not yet taken delivery. I too am looking to have a O/D lock switch installed.
I too have reached out to Matt @Allison and was told the same thing, he was told not to deal with the end user.
So from there I went to a Allison dealer/distributer in my area and asked about having the transmission shift mode changed to the performance mode and have the O/D switch installed. Was told doing the shift mode to performance is not a problem but they had never installed a O/D lock out switch. They asked if I could do more research through Jayco as to whether the main wire harness to the TCM already has the wires needed for the switch to operate. Well we all know how it went with Jayco, they told me to go to my dealer for that kind of information. So i skipped my Jayco dealer and went to Freightliner. The first person @ freightliner basically pointed the finger back to Allison. After a bit conversation he reached out to another fellow that said they could probably look into the harness question but I would have to book the unit in and have a mechanic take a wire diagram and compare it as to whats installed in the unit. So it would cost a few bucks just to fine out whether the wire are in the harness. So that’s about as far as I have gotten fo installation of O/D switch.

While I was at Allison I inquired about having a electronic push button shifter installed. That way a person would have the best of both worlds in being able to choose any gear up or down and being able to choose between shift modes all at the push of a button. Allison does not make a electronic shifter for the 2500 so they could not help me that at all.
But I did a little research and found that Arens and Orscheln both make electronic shifters for the Allison 2000 series transmission, as a matter of fact Arens makes all of the electronic shifters for Allison Transmissions. They just have the Allison name on them.
Unfortunately I have yet to locate any retail dealers that deal with either of these companies.
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Old 05-11-2019, 07:05 AM   #6
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I went to my local Fort Lauderdale Freightliner service department yesterday and I got speak to the transmission tech who will be doing the addition of the OD lockout switch. He seemed very competent.

The tech was unsure about what switch to use, but lucky for me, the previous night Steve (Slow Poke) sent me a photo of his switch and his VIN number. Sure enough, the tech took a screen shot of the VIN and said he will use the exact set up. Perfect! Thank you Slow Poke.

I bring the Seneca in a week from Tuesday for the work. I will keep you posted.
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Old 05-11-2019, 08:16 AM   #7
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That sounds great for you Mark, please keep us posted on how it works out for you. We purchased the same unit as yours 2018 37TS

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Old 05-14-2019, 06:35 PM   #8
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I am also very interested in this....

I am still on the fence with an aftermarket engine tune to bring up the power levels. I like the idea of the OD switch for towing in the hills.


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Old 05-22-2019, 01:07 PM   #9
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Hi - Can someone tell me what this overdrive lockout switch does? Is it to prevent the transmission from shifting into overdrive?
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Old 05-22-2019, 01:25 PM   #10
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Hi - Can someone tell me what this overdrive lockout switch does? Is it to prevent the transmission from shifting into overdrive?
Yes, it locks out 6 th gear to make climbing steep grades more pleasant.

2018.5 and newer Seneca’s have the Allison 3000 transmission that has electronic selection of gears. Before 2018.5 has the Allison 2500 and does not have that option.
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