1990 main electrical short

[T Legg]

If your alternator is only putting out 13.2 volts I would put your battery on a charger and re check it later before you shit can it.

[Tuned forks]

Good idea.

[Pat Conlon]

So it sounds like something is getting squished when you're putting the cover back on...
Notice the compressed black wire, looks like it was pancaked?

If that's what's happening, here's what I would do....

As everyone here knows, I'm not a fan of the internal voltage regulators, both oem and aftermarket.
Sooooo Wait for it....

I would do the remote Transpo voltage regulator mod. Get all that stuff out of that hot shakey environment.

[Tuned forks]

Yes sir. I remember your fondness for that voltage regulator.

[Tuned forks]

Yes, welcome back Joe

The charging system is cooking away to the tune of 13.2V.

Not much charging current there at 13.2v.

Take a resting voltage read at your battery, see it it's fully charged.

12.80 volts or greater....................... 100%

12.60 volts ..................................... 75%

12.30 volts ..................................... 50%

12.0  volts................................................... 25%

If your battery resting voltage is less than 12.60 volts, your charging current should be 14.4 volts or higher.

First things first, take care of that short.

Mr Conlon and Mr Legg were correct. Last week with it's warmer temperatures, the 11.93V battery was fine.
Now the temperatures have plummeted to mid to high forties in the morning. The old battery would not start the engine.
So off to NAPA I went for a new AGM battery.  12.25V out of the box, literally.  Cranks over like an engine possessed. Charges to 14.3V.
Not the source of my shorting issues but I wanted to give credit to Mr's C & L and show other members the effect temperature has on batteries. Particularly borderline batteries.

[Bones]

Not the source of my shorting issues but I wanted to give credit to Mr's C & L and show other members the effect temperature has on batteries. Particularly borderline batteries.

Not just temperature but bad connections as well.  I thought the battery in my car was on the way out because of slow cranking in the mornings, turns out it wasn't the battery at all, just a quick disconnect terminal I had fitted that wasn't making good contact. Replaced it with a standard terminal and now starts as fast as ever.