|Simplified SJ diagrams based on the 1983 and 1984 factory wiring diagrams and a real live 1985 Grand Wagoneer.
If you find errors, let me know. Tom Collins FSJ Wiring is a good source for looking at originals if you don't have your own copy.
Feel free to use, borrow, reprint with all the usual caveats including but not limited to;
the risk is yours, not responsible for errors, and resale is prohibited.
Starting, Ignition, and Charging System:
This diagram was originally posted on the IFSJA while figuring out why my FSJ 12SI alternator was different. At the same time I sketched out the charging circuit wiring diagram (below). The 84-85 factory foldout is near impossible to follow. I used the template from the bottom of post 3 on the Jeepforum Wiring 101
Note: 1986 and later circuits are different - see 1986 Diagram
Go to info about Charging Systems with internally shunted Ammeters
Headlights, Fog Lights, and Charging System:
1983, 1984, 1985 Factory fog light wiring were all similar.
If you take advice, or copy something I have done, you are on your own. I'm just trying to be helpful, but you need to make your own decisions, and know about or discover the risks before barging ahead on any endevour.
The information and pictures on this page are free to use and share by all and may not be sold. If you use something for self profit that I have written, or a picture I have taken or drawn, you are a thief. Plain and simple. If you wish to quote something, you are free to do so. All I ask for is proper credit.
rev. 1. Jan 2017