Ωhm

Speaking of 'Asleep at the Wheel'.

There's one blue wire that runs to all taillamp bulbs. As @The86manche mentioned follow that blue wire. Make sure that RED butt splice isn't tied to GND. Check all bulbs, make sure they're 2 filaments bulbs, except license plate bulbs. I know single filament bulbs aren't supposed to fit, but people have a way of making them fit.

Yes and Yes C158 is located under the drivers side seat. Not sure on how easy it is to get to. Instead try C159 located back by the LH taillamp. With C157 connected, disconnect C159 and try the same test using the headlamp switch with C159 disconnected.

We were young and thin.

Disconnect C157. Using another fuse and C157 disconnected find out if the fuse stills blows when set to the PARK position. This will determine if your shorted to ground (STG) on the front half of the vehicle or the rear half of the vehicle. C157_B (Blue wire).

During my collage years a friend (owner) and I cruise the USA. Had a blast. Here we are at a Rest Area.

PARK fuse (10A). PARK fuse feed 12vdc to C269_B2. When light SW is set to PARK position, C269_R (Blue wire) becomes HOT (12vdc) and feeds your running lights.

I'll take it that the single one just doesn't work at all.

Something is generating duplicates.

I've seen that 502 Bad Gateway problem. Might mean nothing but sometimes when 'new items are posted' (auto update on activity window) 3 or 5 and sometimes up to 7 new items are shown (exact same post) at the same time. Screen REFRESH (F5) solves this and only leave the 1 new item.

Spark plugs are one part of the secondary ignition system. Replace cap, rotor and wires. All are maintenance items.

Looks good.

No joke meant here. But just how do you tell someone their front grille is upside down or downside up without just saying it. We need a pinned TOPIC explaining how something like this can happen. That way it can be tagged and put in the post when this happens. MJ/XJ of the RENIX years have this problem. Two ways to put the same part on. Once again welcome to CC.

Front grille is upside down, needs to be flipped. Welcome to CC.

F5=Refresh. Sometimes that helps to push it along to the next screen.

Hazard Flasher works, still I wonder about the Turn Flasher. I'd replace Turn Flasher, before digging into the T/S SW. Flasher is easy enough. I know you said LH T/S work while the RH don't.

As @Pete M mentioned above, odd that T/S will turn RH bulbs ON only without flashing. Do 4-way Hazard work? All 4 corners properly. Wonder if Turn Flasher is weak or just bad.

"I got a lotta problems with you people, and now you're going to hear about it!" by Frank Costanza.

Is it possible you have a XJ Wagoneer Front Lighting Harness (FL) installed? Is there another connector, similar to this, on the other side? Wagoneer’s have dual beams, per side, for headlamps.

Let Willy enjoy the Parades and trips to the beer store. 4 banger got my vote.

Additional current draw using the ON position: - O2S Heater ON - Chime Module ON - Emission Maintenance Timer ON

Having SBEC, can he do blinky codes? If so, anyone know how it's done?

Disconnect all three wires from one side or the other. Determine if that still blow fuse. If not, reconnect that side and disconnect other side and do the same test on the other side. Checking for faulty fixture. Verify wiring while it all apart.