My wife's friend has an 18 JK but found out there are some JL features installed too. Her JK has the auxiliary start battery that the JL came with. She was having starting issues. The dealer installed a new battery, programmed new fobs, flashed the security, and it still had the same problem...
Welcome to the forum! Get rid of those junk terminals. Wiggling the blue fusible link alternator wire might of wiggled that terminal enough to start it. I had no start issues. Thought the terminals were tight because all the nuts were tight but the terminals weren't tight enough to the battery...
Did you scan it and see what code(s) are stored for the HVAC? The light blinking can mean a few things like blower motor resistor is bad/corroded, rear defrost relay/fuse is bad, actuator(s) need calibration, or the HVAC unit itself is bad.
https://motobilt.com/products/off-road-jack-mount?srsltid=AfmBOopQu4O2YOpCGnEdpLZEBQKH0J3n1LCV8oGKzFw6LHbWH1l75aRu
Pricey but mounting looks universal. So maybe the rollbar is an option?
☝️This is what I ended up doing too. I had added an aftermarket wiring kit with relay and used my OEM switch as my trigger to turn on my fog lights. It worked for a lil bit but the lights would eventually flicker. Got tired of the flickering. I ended up using Auxbeam's slim 4 gang switch panel...
Welcome to the forum! According to Teraflex you can only go up to a 33". Anything bigger you will need 4.75" backspacing. You could run 1.5" wheel spacers. Many on here will steer you clear of wheel spacers. I ran spacers on my WJ for about 10 years. I have spacers on my JKU for 4 years now...
I didn't do a toggle switch but I added a USB port there. I bought Auxbeam's 4 gang slim switch panel. If you ever remotely thought of adding anything other than just a light bar, I'd go this route. Worth every penny!
Welcome to the forum! I do not have the 3.8 but I do know the temp range is from 195-230. When you hit the 230 mark, is it sitting idle, stop and go traffic or highway? Hopefully someone with the 3.8 can chime in on your other questions.