dash/headlight dimming

[jeremy.vaughn 10+ year member]

i have/done

big 3 wireing mod

2 1200 watt subs

1 1200 watt amp

capacitor

infinity refrence front and rear speakers

2 sets of tweeters.

but here is the problem.//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif when the bass hits the headlights and dashlights dim really bad. but on other nights it won't do it at all? wtf why is it doing this.

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[audioatg 10+ year member]

i have/donebig 3 wireing mod

2 1200 watt subs

1 1200 watt amp

capacitor

infinity refrence front and rear speakers

2 sets of tweeters.

but here is the problem.//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif when the bass hits the headlights and dashlights dim really bad. but on other nights it won't do it at all? wtf why is it doing this.

Whats your vehicle. Make, Model. Help out more with that info... Do you only have one battery. And then just the cap. Also what is the brand name of the amp.

 

[Horsemanwill 10+ year member]

are all ur grounds good?

 

[jeremy.vaughn 10+ year member]

2003 gmc sierra single cab

only one battery

only one cap

sony xplod amp

 

[jeremy.vaughn 10+ year member]

yup i sanded the ground areas thouroughly

 

[Horsemanwill 10+ year member]

so it's on a solid piece not just "metal" i mean like a good frame ground? also are all grounds under hood good? how big is ur factory batt?

 

[aturcotte127317 10+ year member]

buy my battery, and no dim garuantee //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[jeremy.vaughn 10+ year member]

its a everstart maxx 875 cold cranking amps

 

[Horsemanwill 10+ year member]

how new?

 

[jeremy.vaughn 10+ year member]

about 1 year old

 

[Enellz 10+ year member]

Get a nice back battery and check your grounds.

 

[jeremy.vaughn 10+ year member]

whats a back battery? the one that runs the subs? how do i wire that up

 

[Enellz 10+ year member]

from your positive of your front amp to your back. The. Ground the back battery somewhere, or use the exact spot were you grounded the amp. Then run your negative from the amp to your battery instead of grounding it to the chasis

 

[jeremy.vaughn 10+ year member]

I used the seat bolt as a ground. i have the wire beteween the seat slider rails and the body which are sanded thouroughly. (i havent added the second batt yet, but i thiught this little bit of info might be helpful?

 

[fbi90909 5,000+ posts]

don't think it's his ground.

this may be something to do with the general wiring.

i had an issue with a friends install where the entire vehicles electrical was dimming VERY bad. he was running less than 1000w on an optima redtop w/ big 3.

his head lights, fog lights, dash lights, amps, head unit, would all dim when even the slightest bass note was hitting. he could set the volume at 3 of 50 and everything would dim horribly. we found out that the terminal cups on the speaker box were causing an issue and instead of using them we directly wired the subs to the amps. the issue was then resolved.

overall, check the wiring. make sure all lines are clean and no strands of wire are all overthe place at the terminal connections.

check all your wires for any breaks.

also watch your voltage. get a multi meter and tell us how stable the electrical is. does it sit at 12v or 14v and slowly dwindle down as you play or does it jump erratically?

some feedback would help us figure your situation out.