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same question arose on the p38 pages about a month ago, it would have to be a custom made bracket based on the belt set up of your engine.
as other members inquired, what would be the purpose/reason?
 

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Some people think upgrading your current alternator to higher amperage is too much work over adding a second one. A single alternator with a second battery of the RV kind will more than handle any electronics, add on equipment like a winch or cooler.
 

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the extra load causes loss of engine power and the main reason for doing such conversion would be the addition of extra electronic equipment such as communications, extra lighting, camper style utilities, big sound etc. its benefit would be to transfer the load from factory set up to the add ones so the factory electric system does not fail or lacks to perform.
other than that in my opinion just for show there really is not much benefit.

many newer vehicles have what they call a smart alternator, which is computer controlled charging on demand. that is a system where it charges normal but when you add extra load like a/c, lights and window defrost the system kicks in an extra short burst of temporary power.
other modern alternator types use a clutch pulley similar to a/c clutch, with the same principle as above, to maintain the engine at peak power performance and thus less emission. this may be what you have seen. our alternators provide a continuous 12 to 14 volts all the time.

my classic has extra lighting, winch, back up air compressor and sound system. I upgraded to a 100 amp alternator from an 80 and to a 1000 cca battery from a 600 cca. so far so good at idle, excellent at 1500 rpm.

thus in summary if you're not doing something extreme a small upgrade would be the greatest benefit.
best of luck .
 

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If you want to put a larger alternator on, one for a ~95 Saturn works. (There are a few posts about the swap) The advantage of the Saturn alternator is that it's a standard GM CS130 but with the correct mounting for the Rover V8. As a result, you can upgrade the internals to the output you need.
 

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For most people, dual batteries would be more useful than dual alternators.

A second alternator provides redundancy, and it would charge your battery up faster if you used a lot of juice when the engine was off. Both of which are cool, and there are probably a one or two people who would actually benefit form this setup.

However, the total output would be 160 to 200A, which would be overkill at the expense of fuel economy.

Anyhow, a cheap/simple way to add a second battery is to buy one of those portable AC battery power supplies and hook it up to an un-switched 12V outlet. Just make sure that it's a model that will charge via a 12V outlet.
 

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For most people, dual batteries would be more useful than dual alternators.

A second alternator provides redundancy, and it would charge your battery up faster if you used a lot of juice when the engine was off. Both of which are cool, and there are probably a one or two people who would actually benefit form this setup.

However, the total output would be 160 to 200A, which would be overkill at the expense of fuel economy.

Anyhow, a cheap/simple way to add a second battery is to buy one of those portable AC battery power supplies and hook it up to an un-switched 12V outlet. Just make sure that it's a model that will charge via a 12V outlet.
you cannot use two alternators on a single circuit to "quick charge" one battery, you overload the electrical system and damage the voltage regulators and diode packs in the alternators.
you can however rewire the electrical system for double charge circuits, that is two alternators two batteries two different circuits.
 

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you cannot use two alternators on a single circuit to "quick charge" one battery, you overload the electrical system and damage the voltage regulators and diode packs in the alternators.
you can however rewire the electrical system for double charge circuits, that is two alternators two batteries two different circuits.
Good point. I forgot that the standard regulator circuitry would need to be completely re-done to run them on a single circuit.


Edit: Something like this:

https://www.westmarine.com/buy/balmar--centerfielder-ii-dual-alternator-regulator-controller--12033007
 
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