2nd 3g alt?
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Junior User
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2nd 3g alt?
i was debating on adding a second 3g on my 77 f150 4x4 400. has anyone added one and do i just wire it in the same as the first. i know the mounts for itll have to be custom but that part isnt a problem
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
The question is, why? A single 3G is enough for most practical uses, all that's going to happen is both internal regulators will cut each alternator's output into half of the one you have now. It's not like you'll "pump more juice." The alternator output self-adjusts to maintain a specific voltage across the battery terminals which is what your single alternator is already doing. You won't see any change at all, unless you're having issues, which would mean something is wrong with your existing system. In other words you are wasting your time.
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i have a big stereo in the truck and lights outside. im just trying to keep the voltage up a little higher. when i turn the stereo up it will go from 13.8 volts down to 11.7 and i already have a second battery
Postmaster
Joined: Nov 2011
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Are you sure its an alternator problem and not wiring? Suggest you check and report voltage with the heavy loads applied at the alternator output stud, solenoid and the point of heavy load where you are seeing the low voltage - with the engine reved up a little. More than about .5 volt difference means you need heavier wire or cleaner/tighter connections between the alternator, battery and load.
Postmaster
Joined: Nov 2011
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... and at least 6 guage from the alternator to battery or starter relay.
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MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
This means you have a problem with your current system; your focus needs to turn to fixing what you have.
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From: Texas
Yes you can hookup multiple alternators. No it will not double your voltage. Yes it will help put less strain on each alternator, so they will keep you at a higher voltage (14vdc) on a load.
Coming from a car audio competitor background. I have seen as many as 18 alternators on one vehicle (Alma Gates' Bronco) to support all the electronics.
An easier option, and that would be less hassle, and look cleaner, is to take in your alternator to be rebuilt. Some electrical shops will rebuild them for car audio, to put out more amps to run more equipment. This is done for certain classes that say you have to have only one alternator. It costs a few hundred bucks, but is less hassle, and less issues to possibly deal with down the line.
Coming from a car audio competitor background. I have seen as many as 18 alternators on one vehicle (Alma Gates' Bronco) to support all the electronics.
An easier option, and that would be less hassle, and look cleaner, is to take in your alternator to be rebuilt. Some electrical shops will rebuild them for car audio, to put out more amps to run more equipment. This is done for certain classes that say you have to have only one alternator. It costs a few hundred bucks, but is less hassle, and less issues to possibly deal with down the line.
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