voltage issue? battery or alt first?

[militarybass]

so in july i put hdc312 with an aq 1200 in. along with a memphis 500watt 4 channel. i did the big three under the hood minus the engine block ground cause its a pain in the ass. i have an 06 mustag gt.stock battery and alternator. i have everything ran perfect. i have everything tuned to 28 volume out of 35 or 36 on the deck with a signal booster. when im going down the highway i notice some songs or bass notes at vol 28 my car seems like its tugging...voltage drop i guess, idk. so im wondering if i were to put like an xspower 2400 in if it would help my problem. i know i need a new battery anyways but idk if i should start with a new alt first or battery.

[Kenyel Dotts]

First find out if you do have a voltage drop. I would say battery if you are not at full tilt all day every day. If you are then I would recommend alt first. But I would look to replace the battery soon after alt. But I really think you just may need a battery only. Don't think that you are pulling that much power But it is always good to have extra juice.

[john253a]

Without the engine earth

YOU HAVE NO BIG 3

The engine does the earth for the alt

Do that first

Second

Get yourself a voltage gauge

Third

Batt

Look at the 3100 it's the best bang for $$$

If it doesn't fit get the highest cc's you can in there

Then if you need a alt get that forth

[militarybass]

thanks guys. ill def do the ground next weekend and order a voltage meter. had planned on a new batt anyways so ill go with that first and if i dont see a difference ill get an alt as well. post pics later.