Upgrade alternator?

[erin]

I'm not sure if this has been addressed, but I was wondering what amp alt. is required to run a winch, air compressor and a few lights. I know the stock alt. in my truck is an 80 amp. Do any of you think this is enough or would it be better for the electrical sys. to upgrade and how much?

Thanks ahead of time for any input

[Scott Brady]

I am pretty certain mine has a 100 amp, which seems to be sufficient.

As there are no alternators that can keep up with heavy winching, I would recommend installing a second battery before a larger alternator.

With lights, a nice set of IPF's or Lightforce with 65watt bulbs is plenty.

So far, even in my "wired like a house" double cab, the stock alternator has been sufficient.

[erin]

Yes, that was my concern, with the TRD package, you have a better alt.. But, if a second battery is a better solution, that is great, because a new alt. is a pretty pricey option. Do you know of any sites that show detailed installs of a second battery isolated from the strating battery? Of all things, I am extremely electrical stupid!!

[Scott Brady]

Here are some cool links for the Baja Taco:

http://bajataco.com/dualbatts/dualbatteries01.html


http://www.bajataco.com/zr2steve/auxiliary-battery.html

[BajaTaco]

According to info provided by Chris King from Toyota of Dallas (trdparts4u.com), my alternator ('98 V6) is a 70 amp, and Scott's alternator ('04 V6) is an 80 amp. I didn't see any 90 amp alts. listed for the '97-'04 Tacomas but that doesn't mean they aren't around. I verified the part # on mine, so I am certain it is the 70 amp. At 135K miles, my 9 year old alternator is still working. However, when running the off-road lights, talking on the VHF radio, listening to the stereo, and running the fridge, I wish I had a higher-output alternator. In my opinion, the stock alternator is acceptable and works okay, (especially if you are going to put some miles on without hi-amp draws, to allow the batteries to recharge) but a 100 amp or higher sure would be nice if you are running high-draw items like 100W lights + toys at night. A higher output unit will also get the battery recovered faster after winching, and hopefully before you get to camp and need all of your reserve to run the fridge, etc.

I am going to be putting new brushes in my alt. soon, and I am thinking about just getting a higher output unit and keeping my OEM as a spare. I am hesitant because my battery solenoid is only rated for 100A.

[Scott Brady]

Chris, you are correct. My alternator is a 27060-62160 which is 80 amps.

Hmmmm, need something bigger.

No wonder the water heater makes things very unhappy pulling 60 amps.

Looks like Camelback Toyota has the 80 amp for $230

170 amp option (no affiliation)

[Scott Brady]

Here is their direct link: http://www.4alterstart.com/

[asteffes]

The '05+ V6 Tacomas with the tow package have 130 amp alternators. I never notice my lights dim at idle or when running the VHF with all my lights and stereo on (roughly 30 amps worth of lighting.)

I think if you need to replace it, get the largest one you can reasonably acquire. It should run cooler at any given load and last longer than the original.

Have any of you looked into having a factory alternator re-wound to provide higher output?

[erin]

Yes, I was looking at a new Tacoma the other week, and noticed that on the sticker with the tow package and asked the service department. That's when I discovered mine was only 80 amps. I was looking at LC engineering and Premeir Power alt. Can you use one thats to big ? I figured somewhere around 110-150 amps would be more then enough for everything that I have planned.
My biggest corcern was the M8000 winch pulls something like 400 amps at full pull. I realize this amount of strain would be rare, but I like to look at worse case scenarios when upgrading, so I don't have to change things in the future. Maybe I'm looking at this wrong though? Any thoughts?

[BajaTaco]

Can you use one thats to big ? I figured somewhere around 110-150 amps would be more then enough for everything that I have planned.

Typically, you will lose 1HP for every 25amps you add to the alternator. I think 100-160 amps is no big deal.

My biggest corcern was the M8000 winch pulls something like 400 amps at full pull. I realize this amount of strain would be rare, but I like to look at worse case scenarios when upgrading, so I don't have to change things in the future. Maybe I'm looking at this wrong though? Any thoughts?

I think for a typical trail/expedition vehicle, a good sized deep cycle aux. battery will be fine for the rare occassions when you need to use the winch to that degree. I think the key factor to consider is the recharge time that will be required once you are done winching and back on the trail. That extra amperage will make a good difference allowing the battery to recover in a shorter time/distance.

You need to weigh the "rate of return" that you would get for investing a lot of time and money on a specialized setup (such as a 2nd alternator). Would it be worth it for the intended application? Unless you have a competition type of vehicle, probably not.