Big 3 Alternator to Batt?
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=76684
Printed Date: July 04, 2025 at 10:29 AM
Topic: Big 3 Alternator to Batt?
Posted By: t0mmyr
Subject: Big 3 Alternator to Batt?
Date Posted: April 23, 2006 at 5:40 PM
I'm doing the big 3 right now, my question is, should I fuse the extra cable i'm running from my alternator direct to my battery? the positive output on my alternator shows B, is that correct? or should i run a thick wire with no fuse to the + battery?
Replies:
Posted By: supradude
Date Posted: April 23, 2006 at 8:45 PM
Fuse it close to the battery.
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'85 Toy
Posted By: stevdart
Date Posted: April 23, 2006 at 8:47 PM
The consideration for this is the location of the wire. Of course, being a power wire means it should have a fuse near the battery just like the power wire that runs into and through the car. But the location in the front of the car, not being hidden under seats and passing through firewalls, allows the option of leaving it unfused. There will be some who fuse it and some who don't. EDIT: I agree with supradude and would fuse it as well. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: t0mmyr
Date Posted: April 23, 2006 at 11:20 PM
i ended up putting a 140amp breaker right near the alternator, then about a 3 foot run of cable to the battery, i feel safe, all electrical turned out nicely, now i just have to install the 4 components, 2 amps, rcas, headunit...and 1/0 cable to the trunk...sigh...looks like ill be busy next couple days off in the coming weeks
Posted By: stevdart
Date Posted: April 23, 2006 at 11:27 PM
Battery. The battery is the power source because it stores. If the wire is shorted it's the battery that will unload its store of amperage. The length of wire between the battery and the breaker is unprotected.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: t0mmyr
Date Posted: April 24, 2006 at 1:38 PM
so should i put an additional fuse on the battery side of the compartment? i don't have another 140 fuse or breaker, i think all i have is an 80 agu
Posted By: audiocableguy
Date Posted: April 24, 2006 at 2:55 PM
If you were to fuse the lead between the Alternator and the Battery, wouldn't damage result to the Alternator if the circuit opened with the vehicle running? I'm sure a direct short isn't good either.
Posted By: t0mmyr
Date Posted: April 27, 2006 at 1:32 AM
well i have the fuse open right now, because it's actually an added wire to the alternator to battery, i left the stock wiring in place and just added on top of it
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