Major dimming. Help!

[phantom240 5,000+ posts]

I have an Alpine MRV-1507 powering my 10" CVX. I'm getting the worst dimming out of any car I've used this amp in. The battery at idle, with the headlights on and the amp at normal listening volumes reads 13.8v. At idle with the lights on and the amp low, it reads 13.9v. I'm running Knu Kolossus 4awg for amp power, and I added a chassis ground to my battery, in addition to the factory ground on the engine block. I had another 240sx like the one I'm driving now, and it didn't dim half as bad. Any ideas where to start, other than spending $300 on a HO alt?

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[CRAZYCORNUTS18 10+ year member]

big three

/thread

 

[phantom240 5,000+ posts]

I got leg one of the big three done, so I'm definately going to complete that one. Is Knu Kolossus 4awg acceptable to do the job? The battery terminals I'm using only accept up to 4awg. When I do upgrade to a HO alt (soon) I will find a way to may 0awg fit, whether it means drilling out the terminals or not.

 

[CRAZYCORNUTS18 10+ year member]

well with the amount of power your running you dont need a new 'alt'

 

[bk12321 10+ year member]

big 3 in kolossus 4 gauge is fine for ur setup

 

[phantom240 5,000+ posts]

Well, I'm adding a 4 channel for my components which brings the grand total of amp draw to 120 amps, and add in A/C, etc... and I'm well over the stock alt's capabilties. I'm also upgrading to electric cooling fans. The stock alt is 80 amp IIRC. I'm going to get an Iraggi 180 amp.