I'm gonna be putting a Kicker 12" L5 Series sub in my truck,I'm not sure what amp I'm getting yet though,should I use a capacitor with this sub?

 

If your lights dim when it hits, I'd put one.

 

when your alternator doesn't put out steady voltage

 

OP, he ^ knows more than I do.

 

http://www.bcae1.com/. caps are worthless.especially in new vehicles, when the alt dips, the cap is usually discharged, repeat 10,000 times, still same result. need a good battery, it has more storage. even a small second battery if necessary. is better than an cap. if ur alt is ho, then a cap could make sense when all ducks are in a row, alt, battery, demand, need for the kick in the trunk..........

 

no

 

When do you use a capacitor? Never.

 

petty much. most vehicles these days have alternators that put out steady voltage thanks to properly designed voltage regulators. no if you hooked it up to an o-scope and found that you have dc ripple in the charging system then you would need a cap

 

Houston, we have a winner!

(however it would be AC ripple in the DC line...)