Do i need a new Alt??

[Nater&Hailey]

So i recently got the 4.0 HDC on my MRP M2000 at 2 ohms and my car is dimming pretty bad, my alt. is a stock 85 amp. its also a crappy NAPA battery under the hood. I know a new alt would be ideal but don't have the money right now. would i be able to just get a yellow top and run it... Big 3 even? I just want to maintain a decent idle voltage (higher than 12.9).....

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[Chriszle 10+ year member]

You can always turn down the volume.

 

[Nater&Hailey]

i do when im stopped, but it dosnt make sense to keep it down, especially with something that has decent potential to be loud.. i never had this problem with my truck but it was a stock 120 amp.

 

[JoeK 10+ year member]

MOAR BATTERIES, MOAR MOAR MOAR! But really, Big 3 and 3-4 80AH batteries would make zeus cry on that alternator. No sense putting in new alternator if the rest of your vehicle was wired as a power-wheels

 

[mlstrass 5,000+ posts]

get an HO alt a few batts and a bigger amp. Waste of an HDC4 off that power level....

 

[quackhead 10+ year member]

i do when im stopped, but it dosnt make sense to keep it down, especially with something that has decent potential to be loud.. i never had this problem with my truck but it was a stock 120 amp.

You should not be playing with big boy toys you know absolutely nothing about.

 

[mclerico83 5,000+ posts]

you need a ho alt what car do you have. putting more batteries will not help because your 80 amp alt will be killed by 2-3 agm batteries easily. get a h/o alt and do the big 3 upgrade

 

[JoiNt- 10+ year member]

do the big 3, get one decent agm deep cycle batt, mqke sure u got 0 gauge wire that shud keep ur voltage as a decent level, i ran a kicker zx2500 on two 15" L7s with big 3, a crappy duralast red top, a stinger spv70, and 2/0 welding cable doin burps at 2700 watts my volt stayed around 12.9

 

[mlstrass 5,000+ posts]

do the big 3, get one decent agm deep cycle batt, mqke sure u got 0 gauge wire that shud keep ur voltage as a decent level, i ran a kicker zx2500 on two 15" L7s with big 3, a crappy duralast red top, a stinger spv70, and 2/0 welding cable doin burps at 2700 watts my volt stayed around 12.9

burps are NOTHING like playing music full tilt for extended periods of time. If you dropped to 12.9 on a burp, try 30 seconds full tilt on music....

 

[rebelfromva 10+ year member]

100+ ah batt and upgrade under good batt and you may be good.

 

[JoiNt- 10+ year member]

burps are NOTHING like playing music full tilt for extended periods of time. If you dropped to 12.9 on a burp, try 30 seconds full tilt on music....

i dont abuse my **** for extended periods of time

and a 20 second burp full tilt IS enough to notice if there is a voltage drop fyi