Not Charging

[California]

There's a thread on here somewhere about that 'dynamo'.

To summarize, early ones had rectifiers on the back but by the time of your YM2020 the rectifiers were external. Output of this dynamo is AC, so test for AC output, and also for continuity (a few ohms resistance) between its two wires to verify that the coils inside are intact.

That dynamo is universal. It is used by Yanmar, Kubota, and a lot of lawn-care equipment in the under 30hp category.

Nearly always its matching regulator is the problem. If your regulator has a 6-wire connector, then any regulator on Ebay that looks the same and has wires ending with the 6-wire connector - will be the same generic regulator.

This YM186 wiring diagram shows that its dynamo doesn't use chassis ground. I expect your 2020 is wired the same.

Does anyone have a link to the prior thread that discussed troubleshooting this dynamo/regulator combination?

 

[Williy]

Why ;not just go the the auto parts store
and get a cheap life time warranty with it

willy

 

[bmaverick]

Why ;not just go the the auto parts store
and get a cheap life time warranty with it

willy

Got the cross reference p/n to an autoparts store brand. That's the clue we need to do just that.

Yanmar liked to used Datsun parts from the late 60s and early 70s. Parts that were prior to Nissan acquiring Datsun.

Datsun/Nissan 1970

 

[California]

The larger alternators on the YM's with two mounting tabs, are generic automotive from the same era, 73 Datsun or similar. That and the matching regulator are cheap at Autozone. Just specifiy the non air-conditoner version for a perfect fit. The higher output A/C one is fatter and needs a different mounting.

But this pancake 'dynamo' with just one mounting tab is unique to small Japanese tractors and similar (maybe battery-start generator sets?). I doubt Autozone has them. Ebay is where I've seen the best prices for this and its regulator.

____________________

Trivia: Datsun IS Nissan. Legend: Some other firm owned a trademark named Nissan in the US.

Per the legend Nissan was all ready to ship over their first cars when they discovered this.

Strategy meeting "What will we do? We need a new name in just a couple of days!" Somebody replied "That Soon?"

"That's it!!!" the CEO replied.

 

[clemsonfor]

The larger alternators on the YM's with two mounting tabs, are generic automotive from the same era, 73 Datsun or similar. That and the matching regulator are cheap at Autozone. Just specifiy the non air-conditoner version for a perfect fit. The higher output A/C one is fatter and needs a different mounting.

But this pancake 'dynamo' with just one mounting tab is unique to small Japanese tractors and similar (maybe battery-start generator sets?). I doubt Autozone has them. Ebay is where I've seen the best prices for this and its regulator.

____________________

Trivia: Datsun IS Nissan. Legend: Some other firm owned a trademark named Nissan in the US.

Per the legend Nissan was all ready to ship over their first cars when they discovered this.

Strategy meeting "What will we do? We need a new name in just a couple of days!" Somebody replied "That Soon?"

"That's it!!!" the CEO replied.

Should it be "Dat soon"?

 

[California]

Should it be "Dat soon"?

That's the urban legend.

True? Unknown.

 

[Williy]

I would go for the single wire alternator
should be less than $50

willy

 

[bmaverick]

The larger alternators on the YM's with two mounting tabs, are generic automotive from the same era, 73 Datsun or similar. That and the matching regulator are cheap at Autozone. Just specifiy the non air-conditoner version for a perfect fit. The higher output A/C one is fatter and needs a different mounting.

But this pancake 'dynamo' with just one mounting tab is unique to small Japanese tractors and similar (maybe battery-start generator sets?). I doubt Autozone has them. Ebay is where I've seen the best prices for this and its regulator.

____________________

Trivia: Datsun IS Nissan. Legend: Some other firm owned a trademark named Nissan in the US.

Per the legend Nissan was all ready to ship over their first cars when they discovered this.

Strategy meeting "What will we do? We need a new name in just a couple of days!" Somebody replied "That Soon?"

"That's it!!!" the CEO replied.

It's sort of like that. Nissan was a Japan manufacture of wartime WW2 military vehicles, aircraft, weapons and chemicals. Nissan Zaibatsu.

So, when Nissan had to export vehicles to North America, the knee jerk to Datsun was to prevent shame and US veterans from raising the alarm of a brutal enemy against our soldiers. You mention Nissan to any WW2 veteran that saw extensive action in the Pacific rim islands and they will spew out a bitter hatred on the subject.
It's so bad, that Nissan was brought to trial for war crimes, yet they barely escaped without being charged.

from a history snippet ---
Nissan was one of the largest players in the Japan war efforts.
Nissan Zaibatsu actually moved its main plant to Manchuko, the Japanese Army's puppet state in Manchuria. This was significant because the old Zaibatsu like Mitsubishi refused to participate in the venture that was supposed to create strategic depth for Japan.

Aikawa Yoshisuke, President of Nissan, was briefly arrested by the allies on suspicions of class-A war crimes. He wasn't charged, but the Zaibatsu itself was dissolved.
---

Datsun was it's own company till Nissan acquired it later in 1934. The Yokohama assembly plant under Nissan started to make Datsuns in 1935.

From the Nissan website

Birth of Datsun and origin of the brand name

[SHORT STORY] Birth of Datsun and origin of the brand name | Nissan Heritage Collection
The company that created the DAT (or DAT Motor Vehicle), which is where the name "Datsun" came from, was Kwaishinsha Jidosha Kojo, founded in 1911 by M. Hashimoto. His dream was to make cars that were suited to Japan and, if possible, export them. In 1914, when he completed work on a small 2-cylinder 10-horsepower car, he borrowed the initial letters of the surnames of his three investors (K. Den, R. Aoyama, and M. Takeuchi) and gave the name "DAT" to his new car.
Later Kwaishinsha merged with the Jitsuyo Jidosha Co., Ltd. to form the Dat Jidosha Seizo Co. It went on to produce military vehicles, but in 1931 the company developed a new passenger car (500cc, 10ps), which embodied the DAT spirit. It was, however, more compact than the original DAT, so it was called DATSON - in the sense of "Son of DAT". In Japanese, though, son is the word for "loss" so instead it was changed to "SUN", which has brighter associations, when the car went on sale in March 1932.

---

So now we all known the rest of the story. Good Day! -Paul Harvey

 

[bmaverick]

The larger alternators on the YM's with two mounting tabs, are generic automotive from the same era, 73 Datsun or similar. That and the matching regulator are cheap at Autozone. Just specify the non air-conditioner version for a perfect fit. The higher output A/C one is fatter and needs a different mounting.

But this pancake 'dynamo' with just one mounting tab is unique to small Japanese tractors and similar (maybe battery-start generator sets?). I doubt Autozone has them. Ebay is where I've seen the best prices for this and its regulator.

So, alternators without the AC option. Nice. I like having a warranty on things like this. Yet, I plan on getting a VR as well, the 'new' style. Even though mine is re-ferb UTDA by Fredricks, the old style, yet new part was used. The old design are prone to over heating.

My Ym2610 is the 35A alternator. Wish there was a 45 or 60A version.

 

[careyo63]

Recalling back and checking into my Chrg. light problem there was several ways to setup these Yanmars. The Org. YM series,Rice patty tractors was hard on the Elec. Sys.. When digging in deep of my dash and Fuse panel I found out this to be true. Both VR. Old Mech. style still up in the Dash and the New SS attached around the Stering column. Found the bad connecton and then curiousity had me check the old one. Works fine!! So now I have both and then seeing my Alt. is actually 12V 35Amp. Which is Huge for my needs. No wonder My old battery lasted so long. Only 550cca. New 700cca now. Cold start is Minimal for the oil light to come on. I was actually shocked looking at the parts book. My Alt. is AL-1235 35Amp. and seen the next common Alt. is a AL-1215. It was much smaller at only 15Amp. and on the 2020 that was just mentioned is listed for it. That much smaller seemed odd.