Check the battery power and earth leads where they connect to the Battery Terminals. I have had the same problem where the plastic part under the cable connection clamp has moved and even though the clamps are tight the plastic stops the clamp from making a good connection. Also check all the battery power and earth leads where they connect to the Engine, Starter Motor and Body. If possible disconnect, clean thoroughly by removing any corrosion or paint that could cause a poor connection, and reconnect making sure all are tight. If you are able, check the output of the alternator with a multimeter. With the engine running at a high idle, the meter should read between 13.8 to 14.4 volts. Again check the voltage output with the headlights on high and the heater fan on high to see if the alternator can maintain its output under load. If the voltage is below 13.5 volts on any test, the alternator is suspect. It is probably that the brushes inside the alternator are worn out or that the voltage regulator is faulty. Auto electricians will usually have exchange units available for replacement.
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