Hello Dick and Welcome -
My name is ***** ***** have been asked to help you here with this issue.
So - you need as you say "an ignition fed positive supply connection preferably close to the fuse boxes"... ..." under bonnet ignition controlled
positive feed "....
Jeep / Chrysler are known
for being very hard to get wiring diagrams for so Im not surprised you have been struggling - they are the worst to be honest !
Now - with this-- you could use for example fuse no. 37 in the main engine bay fuse box- this is an ignition circuit fuse... you could use that ... but - Im going to suggest something different.... and this is because on these later vehicles, that have whats known as CAN enabled systems, piggy backing extra circuits in - to any fused circuit can
create problems... eg - the computers detect extra circuits and cause shut downs etc - Some you can have programmed to accept extra circuits but this is a dealer job and obviously costs money... So what I would suggest is this... remove the cowling behind the steering wheel - and access the wires that go directly to the ign switch.
Then use a meter - or a 12v test light - and probe each of the wires making a note of which is live ( perm feed ).. and which are not - Ign OFF.
Then switch the ign ON - and re check the same way... when you get a light / reading from a wire that previously was dead - you then know that is the one you need... ie, "ignition controlled pos feed"... and you can connect to that wire to feed your circuit. Fit an in line fuse to your extra feed wire -and thats a safe job done. It really doesn't take long at all to do as above and is the best way to be honest with you...for the reasons outlined above.
For the above - I have uploaded this for you HERE
Im very pleased to have helped you - Do let me know if you need anything more --
*** Meantime - - >>>>
Please do click on the "OK/ Excellent ratings"
for me - Thank you
in advance for that...
You can and are most welcome to get back to me anytime you might need - clicking the OK ratings does not close you out at all..
Kind Rgds, MIKE.