OK, so with no load it shows 12 to 13 volts. As soon as I turn the ignition key to Start the voltage drops to 0. Just bottoms out. And that is a new battery.
Any ideas? Is the battery bad? Is the starter dead and causing things to croak?
By the way, tested the power at battery and through the wiring, chassis, etc... Results all the same, so it appears not to be a bad ground like I feared.
And here is a newbie type question. Should the horn work when the ignition is off? (It doesn't.)