Dimming Lights, Big Alt or Cap - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Audio/Video Talk about Chevy Cobalt Audio/Video and other mobile electronics here

LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 12-04-2009, 08:15 PM Thread Starter
Forum Regular
martin_hl2's Avatar
Join Date: Oct 2009
Location: Chicoutimi, Quebec, Canada
Posts: 74
Dimming Lights, Big Alt or Cap

Hello, i would like to know what do you guys use to solve the dimming lights problem if you have it. I have 4 speaker amplified @ 75rms each and a 350rms subwoofer so it totals 650rms and every time the bass hits, the lights are dimming very badly. I have the stock 600 CCA battery and two 1 farad capacitors and it still dims a lot. So i would like to know what do you propose to solve this. Change the alternator to put a bigger one, or a bigger capacitor or just a bigger battery.


edit : 650rms at the amps output, my sub is a 375rms and the speaker are 100 (6x9) & 80(6.5) and im running the sub at 350 and the speaker at 75 each.
martin_hl2 is offline  
Sponsored Links
post #2 of 5 (permalink) Old 12-04-2009, 08:33 PM

Join Date: Feb 2009
Location: Mechancisburg, PA
Posts: 7,805
Send a message via AIM to camopaint0707
cap, battery, then alternator to upgrade first, in that order

camopaint0707 is offline  
post #3 of 5 (permalink) Old 12-04-2009, 08:33 PM
ADIDASS's Avatar
Join Date: Jul 2009
Location: Midland, Michigan
Posts: 280
Send a message via AIM to ADIDASS Send a message via Yahoo to ADIDASS
Run a relay maybe? Second battery? Or... just turn down the bass on the amp so it doesn't draw so many amps. When I had my system in my old car, I had two amps, 1500 watt and 200 watt. The 1500 watt was going to my two kicker L7's that were rated 1500 rms per speaker and the 200 watt was going to my two kenwood 6x9's which were rated 300 rms each. If I turned the volume up too high, the system would suck much more power and my lights would dim each pound. When I kept it reasonable the lights didn't dim at all. I also had a 1.6 Farad cap. Anything pass volume 18 lights dimmed, 17 was my best setting. I also upgraded my alternator. I don't know if that actually help though because I still had the same problems.

^ A lot of rambling but maybe you can find something useful out of it?

Black 2009 SS/TC|20% Tint|Ark Shorty Antenna|Customized License Plate Cover|Customized Front Bowtie|Weathertech Vent Visors|3rd Generation Projectors w/ 6k HID's|IPCW LED Tails|3rd Brake Light Mod w/ Vinyl Overlay|Reflective Black SS Inlays|Nightshaded Side Markers|E-brake Mod|Redlinegoods Shifter/E-brake Boots|AVIC-Z110BT Headunit|Di-Noc 3M Dry Carbon Fiber Trim|Armrest w/ Cover|MRZ "Cobalt SS" Door Sills|K&N Drop-in Filter|GMS1|Goodyear Eagle GT AS Tires|
ADIDASS is offline  
post #4 of 5 (permalink) Old 12-04-2009, 08:42 PM
Cobalt Specialist
Join Date: Aug 2007
Location: Long Island, New York
Posts: 1,115
optima yellow top battery then a bigger alt then a cap.

2007 Black LT coupe
35% Tint all around - Completly debadged - Side Moldings Removed
KICKER ZX 650 RMS interior amp - KICKER ZX1000 RMS Sub Amp
1 KICKER 12" L7 - All new pioneer interiors - Pioneer Avic Z2 W/ GPS
Rockford 1 Farad capcitor - Trunk, Doors, and Rear deck Dynamated - PS2 with guitar hero
Blue footwell neons - Two Alpine type S Tweeters

Engine mods:
K&N air filter
2006 TBSS!
xyankees214x is offline  
post #5 of 5 (permalink) Old 12-04-2009, 09:25 PM
Cobalt Specialist

Nosfuratu9's Avatar
Join Date: Apr 2009
Location: Tx
Posts: 1,442
ok, get a good deep cell battery meant for car audio. optima isnt an actual car audio battery, just a better battery. Shuriken or Kinetik, thats who i'd go with. then get a high output alternator. the caps arent helping you much because its pulling the power off your battery and once the cap's energy is empty it pulls off more power from the battery to "re-fill
Nosfuratu9 is offline  
Sponsored Links
Closed Thread

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome