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Can my 89' veezy just have the voltage regulator brushes replaced, or do I have to buy a new alternator?

I notice the voltage fluctuates sometimes, and the lights get brighter when I apply the gas. Ideas?
 

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Can my 89' veezy just have the voltage regulator brushes replaced, or do I have to buy a new alternator?

I notice the voltage fluctuates sometimes, and the lights get brighter when I apply the gas. Ideas?
The brushes aren't for voltage regulation, they pass current to the armature. Regulation is done by an electronic module on the back of the alt (the one with the heat sink that includes the connector socket - the gray thing is the rectifier that converts AC to DC).

It is true that when Denso alternators go, it's usually the brushes, although the symptom of them going is intermittent charging. I'm not sure if low voltage is an early stage of that, but since it is rpm-dependent, I tend to think the problem may be the regulator. The brushes are cheap enough, though, ($12-$13 including shipping) that it probably wouldn't hurt to try replacing them.

Looking at this site:
http://www.nationsautoelectric.com/altparts.html

This looks to be your alternator:
http://www.wai-wetherill.com/products/sresult1bom.cfm?ManufName=NIPPONDENSO&item=100211-718

And if so, this would be your brush set - the 39-8200 brush assembly:
http://www.wai-wetherill.com/products/partimage.cfm?wai_num=39-8200

There are a couple of these brush sets on ebay, but this one comes with the seal, and looks to be of better quality, and it's no more expensive, in fact is a buck cheaper:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230329760285

This is the regulator, the IN434:
http://www.wai-wetherill.com/products/partimage.cfm?wai_num=IN434

A heavy duty version also available, the IN434HD:
http://www.wai-wetherill.com/products/partimage.cfm?wai_num=IN434HD

Here's an old thread that documents the rebuilding process - to see the pics you have to look at an archived version:
http://web.archive.org/web/20040530...orum/showthread.php?threadid=27270&forumid=10

Another page on rebuilding a different, but similar, Denso alternator:
http://www.fixinrams.com/id12.html

If the regulator is bad, brushes of course won't help. There are other parts that can go bad, too, including the copper slip rings, the bearings, and the diodes in the rectifier. It's possible to buy those parts, too, but by the time you do, you have probably spent more than a rebuilt one costs. Also, the copper slip rings, which are the surface that the brushes rub on, are not easy to replace. Depending on how scored they are, you might just smooth them with some fine wet-or-dry sandpaper or fine emery cloth.

If you buy a remanufactured alternator, stay with a Denso alternator rebuilt either by Denso themselves or sold by a reputable reseller like Beck/Arnley. Rock Auto has both for good prices:
http://www.rockauto.com/catalog/x,carcode,1277704,parttype,2412,partGroup,18

autohausaz also carries the Denso-remanufactured one, but for more $$ than rockauto.

Let us know what you decide and how it works out.
 

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1994 XtraCab 4x4 P/U
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You can get it bumped up to @ 130 amps by:

Boyle Future Technology
12325 Locksley Lane, Auburn, CA 95602

phone: (530) 888-6290

(From TTORA)
Quote:
Originally Posted by Dick Foster
Boyles Future Technology will take your 60 amp and make it something like a 120 amp for far less than the other **** want for a high output alternator or even a rewind. And they will do it the right way with a Y wind and up amped diodes.
For some silly reason, probably stupidity, you can get a Powermaster for a Chevy or Ford app for $150 or so but for Toyota they want 3 or 4 hundred for the same damn thing. Most folks know that both Ford and Toyota use Nippoin Denso alternators, and now there are as many Toyotas on American roads as Fords so what's the logical reason? What ever it is, I just won't play that silly game so found out about the Boyle's folks in Auburn, CA. I think Parts Mike turned me on to them. So far I have never heard of anything but happy Boyle's customers, including myself.

Then there is always: http://www.alternatorparts.com/Toyot...tm<br />
or
http://www.hoalternators.com/
 
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