1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,314 Posts
Welcome to Allpar. 12.2 volts seems low and charging systems can be intermittent. Have the battery terminals been removed and cleaned? Is the negative battery terminal cable ends securely grounded to both the engine and body?
If you have ruled out alternator and regulator, the wiring harness and connectors may be suspect. With the headlamps on and the car at idle, wiggle and move connectors while watching the battery voltage on a meter. If the alternator whine changes or the lights flare and dim, you may have found an 'intermittent' connection. You can also drive with a voltmeter connected to a fuse or lighter socket source for an occasional glance.
Does the ammeter needle move at all? Some of these had bad connections in the dash where they would stay in the middle all the time and not alert you to an under or over charging problem. It should swing + or - at times (like when starting up).
If you have ruled out alternator and regulator, the wiring harness and connectors may be suspect. With the headlamps on and the car at idle, wiggle and move connectors while watching the battery voltage on a meter. If the alternator whine changes or the lights flare and dim, you may have found an 'intermittent' connection. You can also drive with a voltmeter connected to a fuse or lighter socket source for an occasional glance.
Does the ammeter needle move at all? Some of these had bad connections in the dash where they would stay in the middle all the time and not alert you to an under or over charging problem. It should swing + or - at times (like when starting up).