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Old 05-18-2010, 06:31 PM   #1 (permalink)
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3rz alternator upgrade

wrote this up on marlin board and thought i'd share it here. just went to the con this past weekend and it works great.

just installed a winch on my truck and the stock alternator was way too weak before, so i decided to upgrade. did some research and was gonna send it in to have it rewound, but the guy told me they only make parts for the mod for certain years of tacomas, mine wasn't one of the model numbers that they made a kit for and at $185 it was a little expensive. the mr2 alt at NAPA was $200 so i threw that idea out. i had a v6 alt i was gonna add and have two, but the box for the winch got mounted in the only location. sooooo i found a link on pirate of a guy that had all the part numbers and info to do a chevy alt on a 3.4 so i took the numbers and went to NAPA. the alternator # was for craigen and didnt come up in there system so we looked in the book and found one that was close. it had a 6 rib pully and we need a 5 rib so he pulled the correct pully off another and put it on mine.

so here we go:

~105 amp GM alternator, NAPA part #213-4513d $99.89

~ GM plug, NAPA part #EC101 $10.69

~ 906mm serp belt(could be 10mm or so shorter, but not longer)

~ 5/16x2.5" bolt and nut


no major mods had to be done.

first thing is take alt off, take bracket off the block.

once the bracket is off there is spacer/sleeve that is inserted into the forward bolt hole. pound it out then shave a 1/16th or so off it and reinstall it backwards, make sure it isnt sticking out on the inside of the bracket if so grind some more off.

next your gonna have to grinda a little off the alt, you just need to sand/grind down the ribs until smooth. the goal is to get the alternator forward to line it up with the other pullys.

once thats done pull the top adjuster bracket off and put about a 1/4" spacer or washers between the bracket and block.

now reinstall the alt, on the lower bracket i just stuffed a bunch of washers to fill the gap since the new alt has a little shorter mount. a spacer is probably the best way to go though(im lazy)

took the picture from the guy on pirate, it shows how to wire it up.

install the belt and done. took me 2 hours and most of the time was moving things out of the way to get to the alt.

keep going untill flush, i just stopped to take the pic






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Old 05-18-2010, 07:55 PM   #2 (permalink)
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Nice!!!........ I like it when there's some tech in the Tacama section!

Bookmarked for future reference.
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Old 07-07-2011, 08:47 PM   #3 (permalink)
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Did you still use the 175A fuse, even though it's 105A alt?

Thanks for the tech gonna upgrade this weekend.
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Old 07-10-2011, 03:53 PM   #4 (permalink)
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Starting mine right now. Thanks for the info on this. I had to go to kragen and source out an alternator for this and the napa part number did not cross reference.

The only part number that would cross reference was the EC101 for the new pig tail.

I am going to make sure the alternator I wound up with will fit with the modifications and if so I will post the kragen part numbers.
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Old 07-11-2011, 04:18 PM   #5 (permalink)
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Finished up with mine today. I think it turned out really well. The truck seems to have a lot more juice than before. My electric fan runs better and the 3rz seems to be getting a better spark.

I wound up getting a 105 amp alternator off of a 91 chevy corvette with the 5.7L V8 without AC.

The part numbers the OP posted for the alternator did not work at O reily's so the one I wound up using is an 01-0388 for 94.99 and comes with a lifetime warranty.

The swap went really easy I didn't even have to shave any off of the alternator. I also was able to reuse the belt I had before, so I will be taking back the 906 MM one as it was actually too short for my application. I had to add a few washers to the lower bracket and the upper adjusting bracket to line up the fan belt with the other pulleys. In total I had to move the alternator 3/8's of an inch forward.

For the wiring I took the stock plug for the Tacoma alternator and spliced the chevy one in with that in case I would need to put the stock one back in.

Thank you for the write-ups! They have helped me immensely.

Here are a few pictures.



Stock plug remaining.


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Old 12-17-2014, 03:19 PM   #6 (permalink)
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Quote:
Originally Posted by OakieOffroad85 View Post
Finished up with mine today. I think it turned out really well. The truck seems to have a lot more juice than before. My electric fan runs better and the 3rz seems to be getting a better spark.

I wound up getting a 105 amp alternator off of a 91 chevy corvette with the 5.7L V8 without AC.

The part numbers the OP posted for the alternator did not work at O reily's so the one I wound up using is an 01-0388 for 94.99 and comes with a lifetime warranty.

The swap went really easy I didn't even have to shave any off of the alternator. I also was able to reuse the belt I had before, so I will be taking back the 906 MM one as it was actually too short for my application. I had to add a few washers to the lower bracket and the upper adjusting bracket to line up the fan belt with the other pulleys. In total I had to move the alternator 3/8's of an inch forward.

For the wiring I took the stock plug for the Tacoma alternator and spliced the chevy one in with that in case I would need to put the stock one back in.

Thank you for the write-ups! They have helped me immensely.

Here are a few pictures.



Stock plug remaining.


Ive got all the same parts you do, getting ready to do the swap.
I have a couple questions about your swap, did you have to remove the mounting bracket from the block as op suggested and grind down (once the bracket is off there is spacer/sleeve that is inserted into the forward bolt hole. pound it out then shave a 1/16th or so off it and reinstall it backwards, make sure it isnt sticking out on the inside of the bracket if so grind some more off.)
Didnt know if this step was necessary with the vette alternator or not.
Thanks.
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Old 12-18-2014, 09:26 PM   #7 (permalink)
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Nevermind, finished it up today. Had to remove the spacer from the bracket and flip it around as op said. Also did a big 3 wiring (i ended up doing 4 wires though??) Lights dont dim anymore.. Test out the winch tomorrow.
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Old 01-18-2020, 08:56 AM   #8 (permalink)
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Bumpitty bump. I've got a 96' tacoma i'm building that has the 3rz and is in need of an alternator upgrade. I came across several threads including this one that all require modification of some sort. I also found high output alternators on ebay that bolt right up for $140-$190. Is there a reason why i shouldn't get the high output ebay alternator?
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Old 01-22-2020, 02:41 PM   #9 (permalink)
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Does anybody have any experience with these high output ebay alternators?

https://www.ebay.com/itm/145-AMP-135...D/283347864600
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