Even if the amp doesn't accept 0 gauge, you can strip the strands out to make it fit.. There's nothing wrong with using 4 ga wire, it's just better to go with thicker wire just in case you ended up needing the extra power. If you ever upgrade in the future, you wouldn't have to replace the wire.
Is it your whole dash lights and everything dimming or is it just your headlights? if its just the headlights dimming and your voltages do not drop, you can solve the issue by installing an HID kit. If its everything then you might need a stronger alternator.
My take on the cap issue is that it may help you with dimming lights (in your case it didn't) but it hurts your amps and voltage if pushed too hard. IMO I would never buy or use a cap for any reason... I don't see any benefit at all from what I've seen through the years.
unfortunately it is my dome lights and all.
Sometimes they act as noise filters and if you have no voltage or power draw issues, you can use one inline between a 4 channel amp and the battery to regulate any small voltage fluctuations. However this is like one of the very last things you do in an SQ competition car. Makes very little difference to the human ear in daily listening.
Since the batteries are on their way, add them and see if it helps but if it still dims, you'll definitely need a new alt.
I would recommend going with an AGM style battery over a lead acid. They handle rapid charge and discharge much better and are overall much more powerful and stouter batteries.
If you have a sam's club membership, its pretty cheap for a duracell platinum.
Yea I found a place close by that has Duracell Ultra Platinum AGM battery for a decent price haven't seen those brands but I'm still searching around
That battery would do just fine.
