@nelstomlinson
Had the same problem back in the 90s in a 1972 Dodge Polara my dad willed to me. I was up in the top of Yosemite backpacking alone. When I got back to the car the electromagnetic clutch was squaking badly and finall seized. A ranger called the gas station in the valley and a big boy driving a heavy duty rig drove up and cut my alternator belt so I could drive. Genius...not. But it let me drive with no juice going to the battery.
I had to drive down the mountains, through Fresno, and another 20 miles to Kerman where I lived stopping along the way at gas stations to put some juice in the battery. Almost made it home on one candle power in the headlights (it was now dark). Almost got hit at an intersection in the middle of nowhere when a car almost didn't see me coming and I couldn't stop or the engine would die. Made it next to a canal and house with a tall chain linked fence around the property. I yelled to the home to see if I could use their phone. They didn't even come out but called my buddy who came and towed me back in (or brought me a battery, I don't remember which).
This taught me to have an extra battery on board and to have extra battery operated lights. I have LOTS of those red triangular LED lights from Harbor Freight that I use for red rear lights. They have solid white light, solid red, and flashing red positions. I tape them on the back of whatever I'm driving. As for front driving lights you'll have to use some off road lights that you can run on your extra battery.
Nice that we have cell phones to call for help now (if you're somewhere you can get a signal!)
Being a full timer RVer, even when in the tiny truck camper (my avatar pic) I carried a tiny Yamaha 500W 4 cycle generator. It's built in battery charger saved has me several times. First time, when the alternator went out. Then a year and a half later when the batteries got too weak.
I could have gotten tows both times, I had cell reception and I have roadside assistance, but I prefer to save that for a real emergency. I still carry it in the 27ft Class C (hitch cargo box that I had on the truck) despite the big 4000W generator the RV has, since it can charge the house batteries through the RV converter and run my laptop, plus run the LED light bar I use when I have 120V power... and it uses a fraction of the gas.
I carry an old portable, handheld style CB radio that has a 12V power jack, so no internal batteries needed, but I've never had to use it in over 2 years I've been on the road. I'm probably overly prepared, but oh well.