Hi,
I've recently bought a mustang that looks like it had a new altenator and battery. The ammeter shows between 11 and 12 volts. The car finally died and of course the battery was dead.
We tested and recharged the battery, and swapped out the old alternator and regulator with one that has the two together. Unfortunately, this didn't fix the problem as the battery drained again. I swapped batteries and am still having the same problems.
One strange thing that may be related. The tach reads about 1200 rpm with the ignition switch off, but when I turn it on (without the engine running) it drops to 0 rpm where it should be. Any good ideas?
Thanks in advance,
Ted