My best friend and I went in halves on a late 50's bug while just out of high school in about 1984. The wiring was totally wonky, turn on the blinker and the brights would come on, stuff like that. Pretty good background for trawler wiring now that I think about it.
We needed a stereo, so we taped/screwed/strapped a modern head unit in the dash and put speakers on the rear dash. But it was 12V and the car was 6V, so we just kept a charged up group 27 on the back seat and ran the wires forward to the dash. When the Lynyrd Skynyrd or Buffett stopped playing we knew it was time to charge up the battery with my dad's trolling motor charger.
Floor pans were so rusted out that if you pulled back the carpet you could see the road passing under your feet.
As mentioned above, it was amazingly good in the soft sand on the beach, and would do multiple 360s in a wet parking lot if you pulled the hand brake.
In the end, we ran it off of a 4 wheeler jump way back in an orange grove, and did severe damage to the suspension. We just took off the plates and walked away from it. Never saw it again.