[Bassasasin]

Your charging circuit consists of a small wire to the alternator and a large line to the alternator. The small wire is the control wire that tells the alternator what voltage to maintain..

If the battery is good. Inspect clean the red cables at the battery and the connections at the alternator.
These at the alternator and battery have the history of getting corrosion and fail. The terminal ends even get corrosion where the wire goes into the terminal connector that is attached to the wire. Check them well.

The Temperature alarm is sayin you have a coolant system problem. Most often is the thermostat is not opening. It is a easy part to replace. The other possibility is your radiator is clogged or inefficient and you would need a flush..




Good Luck