Had headlights, then high beam only, now nothing

67Dart273 said
OP......check your battery voltage when running at "high fast idle." You may have a problem causing bad over voltage. Is the battery bubbled over?

I have to say, I didn't even think of doing this simple step, Thanks for bringing it up & the battery is a sealed battery, w/ no signs of bubbling over. Thanks though.

Mattax said
Take the time to understand the situation. Its too complicated to work on when you got other things going on.
A couple fundementals. Voltage is always present in the lines connected to the battery. Just like there is always pressure in the water lines of your house or in the air lines of a shop.
Pressure only drops when it is getting used faster than it can be replaced. Otherwise its at max everywhere.

Current (amps) is electricity flowing when there is a path creating a full circuit (battery positive to negative or alternator output to ground)

Taking that schematic for an example.
One way for electricity to be flowing through the socket with no bulb in it is if a headlight wire is grounding after that socket.
View attachment 1715338397
If the short to ground is poor, then some current may flow though the parking lights.
If the short to ground is good, then all the current will take the path of least resistance.
Since the breaker didn't open right away, there's prob some resistance in the short.

I agree, it is very hard to keep your thought process straight, with other things going on & it doesn't hep that even though I have always taken care of our vehicle issues, but it has been a long time, since I had to do much trouble shooting, especially on electrical problems. Got things going on today, but I am in hopes of getting back on this, hopefully, either this afternoon or tomorrow. I will rest a lot easier though, when I can get past this, just as soon as I can, but making sure it IS solved though. I appreciate the patience and understanding.