I noticed today with my sub turned up loud my headlights and interroir lights dim should I Get a cap my amp is only a 400 RMS amp, does it really matter what brand I get I don't have plans on upgrading my amp?

 

if 400 watts is dimming headlights there may be an electrical issue (this could be car or stereo related)

when the headlights dim;
1 is the car running
2 who did the install
3 how old is the car/ battery (what size)

 

no! a cap will only make things worse for you. think of it this way, the caps job is to supply you with a jolt of power when needed. if your electrical system is already weak then the cap is going to do what it is designed to DRAIN YOUR BATTERY. it doesnt know when to stop sucking power. id try getting a rebuild alternater or a HO if your going to add more amps or subs. just remember abattery and cap are only storage devices, your power is generated by the alt.

 

Its a 2003 Trialblazer.

My amp is 800 Wat Max its a pieneer amp and Dimond D9 Sbu 1600 wat max it only dims when there is heavey bass and I Have it cranked way up and the car is running I Noticed it last night while I was parked at a red light also when I turned on the interoir lights they where dimming too. Its pretty loud for a 400 wat amp.

 

this is the amp I have Amazon.com: Pioneer Gm-D7400M Mono Amplifier With 800-Watt Max Power: Electronics

would to small on power wire cause this? I Have like 8 Gauge I think?

 

I think the battery is an older smaller size one, I remeber when we got the truck I thought it was pretty small for a SUV

 

I did the install myself.

 

Just do the big 3.

 

what does the big 3 do? I tried searching and found out how to do it but it doesn't really say much else?

 

it WILL improve your electrical system by quite a bit. you battery will charge faster. go pick up a 4awg wiring for your amp and buy about 14ft of 1/0 for your big 3, dont forget to buy ring crimps