alternator question

[matador_de_sa 10+ year member]

My stock alternator is rated for 85 amps. My question is if I have 2 amplifiers, one with an 80amp fuse and the other with 2x30 amp fuses, will I destroy my alt if I listen to my music at high volumes or will it just run down the battery even while I'm driving/idling?

Unrelated question, will installing a second/third battery in the trunk help my electrical system with voltage drops or will it simply power my stereo longer with my car off?

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[matador_de_sa 10+ year member]

help please?

 

[terra 5,000+ posts]

batteries in the trunk will help stabilize voltage. but i wouldnt run 3 on an alt that size. 2 maybe.

 

[jrwalte 10+ year member]

Demanding more out of your alt will kill it faster. Heat damages an alt. The more power you demand out of it, the hotter it will continuously run.