Alternator Diode

[GSP7]

Report:

 

Took My alternator off and to a local Alt/Starter rebuild shop. To double check it for bad diodes. My alternator bench tested OK . He then took the back off and to check the diodes individually with a meter, and I had "1" bad diode

 

I was charging Volts:  D.C. 14.30 and My A.C. was .055+/-

 

Moparmans video, he checked Volts at:  DC 14.25,  AC .005-.015   IIRC

 

The Alternator Shop (Jason) Ordered a new Rectifier/diode pack about $25 and Im putting in new brushes $9.00 as long as I had it apart.

 

The above numbers are a reference to go by .

 

My Alternating Voltage Test A.C. .055+/- I thought was ok , But I did actually have 1 bad diode. There are 8 diodes on the diode pack

 

I will recheck my AC volt reading with 'New/Good Diode Reference' when reinstalled the Alt. with its new diode pack

 

Rick

 

 

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Edited April 7, 2015 by GSP7

[Yankneck696]

If you can get the part number for the diode pack, that would be cool. Also which alternator you have. I have good numbers on mine, but want to replace them anyways.

 

Ed

[GSP7]

 I have a Denso alt. I'll get a part #.

 

I saw LarryB has rectifiers/Diode pack, But $75 is way, way over priced, Pretty sure they are cheap chinese too.   Even searching on line I found them for $35

 

After seeing what the Alternator shop guy work on mine and what he did and checked. I can check my diodes at home next time with my fluke multi tester

 

If your original 'quality' diodes are good, I wouldn't replace them unless they go bad

Edited April 8, 2015 by GSP7

[Yankneck696]

Heck, at $25 I'll replace them yearly. I have remanned hundreds of alternators when I worked at a shop. With the part numbers for the diode pack & brushes, I can make a tutorial for the members.

 

Ed

[GSP7]

Found this:

 

http://www.aspwholesale.com/index.php?_a=category&cat_id=108

 

Select, make, model, year and you can find part #'s for all alternator parts and starter parts

 

for my '99--- Rectifier - Nippondenso 120-136A ER/IF Alternators w/ 130mm OD Stator

Product Code: INR734P

 

Rick

Edited April 8, 2015 by GSP7

[Yankneck696]

I checked out their site. Not bad. I'll call the place I worked in the 90s & ask if he has any connections for US built parts for our trucks.

 

Ed

[Me78569]

Thanks for the link.  I need to do this to my alternator. 

[Mopar1973Man]

I think someone needs to update the article...

[GSP7]

My GOOD Alternator just installed with New Diode Pack, New Brushes Tested with a Fluke meter- Volts DC 14.2 / AC .019-.027+/-

 

AC is down from .055+/-

 

Jason that owns the Alternator shop says the AC wave numbers test he doesnt use, and dont mean anything to him, He removes the Rectifier/Diodes and checks them each diode on a meter.

 

It looks like checking the AC volt wave does show a reference for a bad diode or diodes though

 

He also told my NO rectifiers or other parts are made in USA anymore. All available parts are made in china/korea.

Denso japan doesnt even sell replacement Diode packs etc either, just the whole alternator

 

 

.

Edited April 8, 2015 by GSP7

[Yankneck696]

If there was space, I'd just stuff a 350 amp Leesce Neville in there with an outboard rectifier setup.

 

Ed

[pepsi71ocean]

Hey guys,I just wanted to let you guys know that I'm hot on the trail with the rectifier, I spoke to Larry B and picked one up for testing on a Napa alternator, and I will see how it goes.

I also am looking into finding them and making them reasonable as well. We will see. I shall keep you informed.

[Buzzinhalfdozen]

Looking forward to updates. I can't seem to find and aftermarket alternator they will hold up.

[Mopar1973Man]

Like my conversation with Pepsi over the phone the big problem is who is re-manufacturing alternators. Like NAPA might have several places scattered around the US who knows if they hold the same quality standards from place to place. As for diode failure its from heat created by high current flow lke during extended  grid heater use.

[TFaoro]

I'm interested to know if this is only good for the denso alternators. I believe mine is a bosch (1 plug and 1 post, not two posts)

[rburks]

I'm interested to know if this is only good for the denso alternators. I believe mine is a bosch (1 plug and 1 post, not two posts)

subscribed 

[pepsi71ocean]

I will be pulling both of the alternators apart to compare them. And I hope that the rectifier will work in both.

I will also make an article out of it as well.

[banzaitoyota]

Looking forward to updates. I can't seem to find and aftermarket alternator they will hold up.

 

http://www.mechman.com/alternators/

[JAG1]

I will be pulling both of the alternators apart to compare them. And I hope that the rectifier will work in both.

I will also make an article out of it as well.

This so good that you are going to do this. I will bet the Denso is better built than the Bosch.

There is a big deal about Balmar Alternators in the marine industry. Very expensive, I hear sailors rely on them to help survive at sea, but, sheesh! $5-700 bucks each.... that's going overboard. Problem too is you don't really know if they are that much better and when you realize the disadvantage they place on their units by painting them. That's not right as it won't dissipate heat with the heavy powder coat on them.

[TFaoro]

This so good that you are going to do this. I will bet the Denso is better built than the Bosch.

There is a big deal about Balmar Alternators in the marine industry. Very expensive, I hear sailors rely on them to help survive at sea, but, sheesh! $5-700 bucks each.... that's going overboard. Problem too is you don't really know if they are that much better and when you realize the disadvantage they place on their units by painting them. That's not right as it won't dissipate heat with the heavy powder coat on them.

Well... you say that but I wonder what real world data would say? Mike, which one do you have? How many miles? Mine is original at 188k and goin strong.

[JAG1]

I had my denso go for 240k on my first gen Dodge, so I switched from Bosch to a Denso on my second gen truck when the AC noise level was a bit too high. The mileage was around 50/60 k when I switched it out.