dimming is probably not caused by alternator. alternator just recharges the battery when it is needed. your battery might not have the instant power needed to pump the bass and you should definitely be using a capacitor between the battery and the amp. a battery upgrade might also be an idea.
usually dimming lights is from poor grounding but could also be caused by using too thin of a cable. when i wire an amp the minimum that i will use is 4ga wire. what GA cables are you using and where is your amp grounded to?
i would also upgrade the chassis to negative terminal cable. remember it is only as effecient as the smallest wire in the circuit.
0-500watts just 4ga wires
500-1000 add capacitor .5F minimunm
1000+ should probably have a second battery plus 1F cap minimum
HID lights only draw 35 watts as opposed to halogens 55w. there is a ballast w/ transformer that steps up the voltage high enough to arc the electrodes.
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