I have an 03 ES 2.4....
I have an old Alpine MRP-200 amp and two ten's.
When I turn up the sub output on the head unit and the bass hits hard my lights dim at idle. When above idle they do not dim.
But putting a voltmeter on the battery terminals the alternator is putting out 14.3 volts when the bass hits it drops to 12.3....
Should I install a cap or is the voltage reg going in my alternator?