second battery, alternator lifespan?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=107730
Printed Date: May 12, 2025 at 11:00 AM

Topic: second battery, alternator lifespan?

Posted By: bass4040
Subject: second battery, alternator lifespan?
Date Posted: September 26, 2008 at 4:29 PM

I want to install a second battery using an isolator. Does this lower the lifespan of the alternator. I will play the stereo with the engine off in a modest system.

Replies:

Posted By: frozenuts
Date Posted: September 27, 2008 at 11:23 AM

Anytime you add anything that needs to be powered by your stock alternator, you are putting a strain on it. This includes amps, batteries, power caps, winches, power inverters, hids, ejector seats...you know, the usual. Engine off, however, you are never gonna hurt your alternator, unless you beat it with a hammer.

What kinda stuff do you have in your unknown vehicle?

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