What battery suits my setup?

[gthbryce 10+ year member]

1989 f-250 xlt lariat 7.5 liter v8 with plans for adding two Amps for the door speakers and for around a 10 inch sub underneath rear seats. Also a possible computer being put in the center console. And maybe an alternator upgrade.. What's a good battery that's not over the 400 range that can take care of all my needs and never leave me stranded?

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[audiolife 5,000+ posts]

number of amplifiers means nothing without knowing the power of the amps. You can have 1 amplifier draw more power than 6 amplifiers of another kind. If you are staying under 1000 watts a stocker battery can work or an AGM stock sized battery can work (for audio I would tend to lean towards more of a deep cycle AGM). Alternator again would depend on the power of the amplifiers. 130 amp would be a good start for about 1000 watts and under 160 amp-250 depending on how much power you will run.