Originally Posted by Jsboening
You should be all good until you decide to install a huge winch on the front. Then you may want dual alternators.
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dual alternators wont help much. Even a 20,000lb capable winch is ounly going to draw 100amps, which the stock alternator WILL handle if the vehicle is running, and all accessories are turned off. Replacing the battery with a better, dry cell battery would be more beneficial, cheaper and easier. The biggest difference will be how long you actually can run the winch without having to stop and turn it off, while waiting for the alternator to charge the battery. 100amp winch will run abotu 45 sec-1min with engine off, and still have enough juice to start the vehicle.
point being, the steps before a 2nd alternator would be- better battery- higher output alternator, then a 2nd. Although Im pretty sure a 2nd alternator will make the computer freak out... meaning the computer would sense the battery being charged, and limit the STOCK- 1st alternator. resulting in the 1st alternator not outputting much, because the battery is getting what it needs from the 2nd.