Tow Harness Testers and ESS

[Gee-pah]

It seems that a 7 pin tow harness tester, attached to the hitch plug provided by FCA, for those who order the trailer tow package or install the MOPAR 7 pin kit after sale, disables ESS.

https://www.jlwranglerforums.com/forum/threads/devices-to-bypass-auto-stop-start.57248/post-1242247

The rig, it's reported, thinks it's towing something and disables ESS.

I've watched videos of installs of this MOPAR kit. (I own a 4 pin harness, which I installed, and that's fine for me.) Many of the wiring connections happen at the tail lights--one I think under the hood at the Power Distribution Center's high amp fuses on the right, at the first fuse (closest to the front of the rig.)

I was wondering if there was any way to install a 6" long 7 wire cable, fused of course, attached to a 7 pin connector at points strictly under the hood, and then slap a tester at the end--again all under the hood.

If this ESS disable route has consequences please share.

Thanks.

P.S. I get this may not be doable if certain electronics are only accessible at the tail lights.

I can read electrical schematics but it's not where I "cut my teeth." If you can:

https://www.jlwranglerforums.com/forum/threads/jeep-jl-wrangler-wiring-diagrams.19185/

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[Gee-pah]

I've done a little bit of research on this since posting the above.

At the link of the above post there's a specific diagram for the 7 pin tow harness wiring:

https://www.jlwranglerforums.com/JL-Wiring-Diagrams/TRAILER-TOW-SYSTEM.pdf

The 6 fuses (plus ground) that carry current in the 7 pins seem to be 111, ground, 36, 109, 37, 90, and 107.

If I get the chance I may hook up these locations to a 7 pin hitch plug and 7 pin tester, all under the hood, and see if it disables ESS.

This member reports success with this, at least in the factory 7 pin harness at the vehicle's rear.

@huberro2

http://www.jlwranglerforums.com/forum/threads/any-engine-with-ess.51069/post-1133243

I don't claim to know what other side effects there are, if any, of the JL thinking it is towing something, (or other things) like MPG for example, or accessing these lines for testing without the wiring control module that is part of the wiring harness assembly proper.