Radio: There is no code to enter. Either you have a blown fuse or two, or your factory radio may have been damaged during the battery install. The negative lead should always be the first off and the last on. Interior lighting: Either a fuse, the bulb, or the door switch may be acting up. The door switch can be easily removed & cleaned or replaced and is a common maintenance item on the Contour/Mystique. They typically need cleaning about every 70k miles or so, more if your climate causes electrical components to corrode.
not charging the battery properly... check the alternator.
I have a 98 mystique, and when the check engine light comes on, I simply disconnect the positive battery terminal for a couple of minutes. When I replace it, the check engine light is cleared. It resets the computer.
Normally it means the alternator is failing.
Follow the + battery cable should connect to relay
the whole cable or just the cable ends ??????????????
YES
This light is warning you that there may be a problem with your battery. Have it checked.
Usually on the lower end of the engine follow the + battery cable to the solenoid and then to the starter
under the left side dash and under hood by battery
There is a battery light above the engine temperature gauge
The security light has a faulty fuse and needs replaced. The vehicle not starting unless boosted means the battery has a dead cell in it .
Anyplace that sells batteries has this info.