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I'm running 2 Alpine type R 12's with a JL 1000/1 amp. Can't hardly listen to the system turned up much at night due to the lights dimming so bad. I've read that you really need to upgrade your alternator wiring and possibly alternator before you worry about a capacitor. This info was not about diesels. Will simply adding a good sized cap solve my problem?
 

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It will help some, also bigger alt wire .
 

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You should consider "big 3" wiring upgrade. Make sure batts are good. That jl amp shouldn't do that.
 
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