If you take a look at the photo I edited for you, you can see how to wire the 7-way connector on the vehicle. Make sure to wire by function, not wire color.
Perhaps a better way of doing this would be to use an adapter like the # 37185. If you need to install a brake controller, you could use the ETBC7 install kit mentioned in the question you referred to. The 37185 adapter is included in the kit, and would plug directly into your existing 4-way, leaving 3 remaining wires to be attached.... view full answer...
The SuperSprings Stabilizer and Sway-Control Kit # SSA8MTKT will fit both 2- and 4-wheel-drive models of the 1991 GMC Jimmy.
These helper leaf springs provide selectable reinforcement to OEM leaf springs and can be installed to provide increased ride height if desired. These bolt-on maintenance-free helper leaf springs will automatically deactivate when the suspension is not under load. They will help to prevent twisting of the OEM springs and will help compensate for minor spring fatigue... view full answer...
I'm not seeing any custom fit wiring options for your 2004 GMC Jimmy so if you're installing something like the Curt Powered Tail Light Converter # C59236 then yes, you will need to connect the ground to a clean, bare-metal surface and then route the power wire up to your battery to power the unit. view full answer...
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