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13.78 isn't too bad. A new one will put out over 14 volts. Does it increase over 13.78 when you put a load on at idle (extra lights, radio etc)? If the output eventually drops to nearer 13 volts you will need to get the alternator looked at.
13.78 isn't too bad. A new one will put out over 14 volts. Does it increase over 13.78 when you put a load on at idle (extra lights, radio etc)? If the output eventually drops to nearer 13 volts you will need to get the alternator looked at.
