can alt. handle it please help

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=25668
Printed Date: May 10, 2025 at 4:30 AM

Topic: can alt. handle it please help

Posted By: pureRF
Subject: can alt. handle it please help
Date Posted: February 01, 2004 at 3:10 PM

Ive got an Eclipse aluminum 15 being pushed by an Alpine MRD-M500 and have NO trouble with lights dimming or nething. I have a 2000 4runner and it says on the fuse box under the hood it has a 120 amp alt.. So could i add another mrd-m500 without having to upgrade to a HO alt.?

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dream it, build it, fiberglass it

Replies:

Posted By: customsuburb
Date Posted: February 01, 2004 at 3:30 PM

well.... take 500 X 2 = 1000 which would be the RMS power in 2 ohms coming from your amps ,then double it for amplifier inefficiency which equals 2000. Now divide by 13.8 which is the average voltage of an alternator which gives you about 145 then divide by three because the average music signal takes a third of the power that a test tone does and you get about 48 amps which is your amps approximate current draw. I think you should be ok probobly.

Posted By: Alpine Guy
Date Posted: February 01, 2004 at 4:11 PM

ya you'll be fine, i had 3 mrd-m500's runing this summer, and my voltage droped down to 12 v only at night while waiting at stop lights, and my Nissan Pathfinder has a old worn out 70 amp alt.

Posted By: pureRF
Date Posted: February 02, 2004 at 4:42 PM

thanks guys ill hopefully be getting that all in over the summer.

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dream it, build it, fiberglass it

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