== == A loose battery cable will allow the alternator to run 'open circuit'. This puts the engine computer and other equipment under alot of strain from having to deal with very poor quality power. (essentially pulsed dc with some high voltage spikes and varying with engine RPM) The battery greatly stabilizes this dirty power. Assuming you didn't fry your engine computer, I'd try just resetting it. Disconnect the negative battery cable. Wait 5 minutes. Hook it back up. Try to start it. Beware of doing this if you have an anti-theft radio or an ignition key with a chip in it. You'll likely end up needing the dealer. The harder the copper wire presses the more energy will flow through it.
most definitely
Yes, if the cable is cracked and swollen it has a high resistance thus causing a loss of current. Replace any cracked or swollen cable.
Yes, cause a reduction of power to the engine. It will result in a power-train malfunction error
Hard to say. It may cause no damage at all and then again it might cause serious problems.
dead battery, or a bad ignition control module inside the distribureator.
if you have good battery and cable connections, the starter motor or starter relay is bad
Yes, a loose cable actually could cause those problems, as well as others. I was dealing with a large variety of electronics problems in my last car. They included the problem you described. When I finally took it to the shop, the battery post itself was very loose. They tightened it back up, it took about 2 minutes, and all of my car's problems were solved.Check your antenna connections.
Battery, starter, fuel pump, ignition, computer,................
For a good start, see "Related Questions" below for an exhaustive review of diagnostics for hunting down problems that cause the battery to drain down.
Its called a parasitic draw. Any electrical component in the vehicle could cause it. To test for a draw, pull the negative battery cable and use a meter to measure amperage between the battery terminal and cable. The reading should usually be below 50mA or <.050 amps.
Always hook up the red or positive cable first, otherwise you could cause a short between the battery and the car through your wrench. Ths of course could cause an explosion or other problems. The black or negative cable goes straight to the engine and the car's frame, so your wrench can touch the frame when you are tightening the cable end on the battery with no worry.
Cause a no start situation.