What aftermarket alternator should I get? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 8 (permalink) Old 01-11-2011, 08:12 PM Thread Starter
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What aftermarket alternator should I get?

So I have an 2003 mazda 6s. I have upgraded the sounds system in it, two JBL 12", 1400 watt Pyle amplifier, and a Rockford Fosgate 1 FARAD capacitor. I need to get a bigger cap because the amount of wattage im pushing is to much for just a one farad cap. Im going to be getting a 5 farad cap but I need to upgrade my alternator in order to handle the power required for the bigger cap and the almost 4000 watts im already pushing. What would be a decent aftermarket alternator to buy? 100, 140, 160 amp alternator????
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post #2 of 8 (permalink) Old 01-11-2011, 08:33 PM
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upgrade your ground, and your alt charge wire, and your battery. ive been running two 1500 watt RMS class D amps for a few years with no cap at all. and have zero dimming and no charging issues. but have upgraded my wiring, and battery.

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post #3 of 8 (permalink) Old 01-11-2011, 11:55 PM Thread Starter
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what wiring and battery did you get? did you got with XS power for the battery?
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post #4 of 8 (permalink) Old 01-12-2011, 08:52 AM
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xs power batteries arent all they say. lol. all my wiring is upgraded to 0/1 gauge. and im running a kinetic 2600cca battery. i originally had two of them, but after the first year realized i didnt need both. so now im down to just the one battery.

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post #5 of 8 (permalink) Old 01-12-2011, 07:14 PM
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Exactly. Capacitors are just a crutch for people that run too small of a wire from their battery to their trunk.

I also ran 0/1AWG when I relocated my battery to my trunk. That and an Optima Blue top and everything is perfect.

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post #6 of 8 (permalink) Old 01-12-2011, 11:05 PM
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please don't buy an aftermarket alternator........... have yours rebuilt for more power...... most shops will do it for 5-10 bucks more than the cost of a rebuild(usually ~90 bucks)
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post #7 of 8 (permalink) Old 02-04-2011, 10:16 AM
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Any reason why you are using "4000" watts?

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post #8 of 8 (permalink) Old 02-04-2011, 11:04 AM
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600 watts is plenty for 2 15"

I hook up my DJ speakers in the car. 600 watt alpine mono amp down to a 2 ohm load with fan on it. Speakers are 4 ohm, paralleled. When I disc jockey 4 ohm a side gives me good power for DJ'ing and doesn't over heat my QSC amp (450 watts/side). Second small battery in rear is kinetic 850 I believe (second smallest, fits perfectly, glued down, squished by speaker). I had to have a fuse in front of the battery and a circuit breaker off main battery (yellow top Optima) to it for safety reasons in case get hit from side. Big oversized wires. Also make sure you put an extra ground wire from your main battery to ground nearby to it. a spot less than 6" from original ground wire is good (battery mount bolt). Don't use the same ground spot as OE. back seat is removed and piece of wood bolted down in place. I had to re-insulate rear door and throw extra insulation in roof to reduce rattling. Siliconed rear licence plate.
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Last edited by BigAlDJ; 02-06-2011 at 02:45 PM. Reason: under hood pic
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