Should check the alternator as 12.7V is a bit low for charging.

 

you should see upper 13's to low 14's with a/c and lights on at operating temperature, 12.7 battery voltage while running is way low.

probably a bad voltage regulator, which unless you can find someone to replace it, or do it yourself, you'll be replacing the alternator.

 

I second that voltage regulator.

Regards.
aam.

 

Dear RKH,bearone2,aam.

Thank you for comment.

Does anyone know voltage regulator selling store?
I've asked some ebay shop, but they saids they could not supply regulator.

 

Please see 1996 SL320 BOSCH Voltage Regulator p/n 1197311242 - AutohausAZ.com at $26.89

or

BOSCH Voltage Regulator p/n 0021549206 - RM European Auto Parts at $35.35

NOTE: Only for use w/ BOSCH Alternator

NOTE: always supply VIN when purchasing.

Please read the attached PDF's.

 

Dear lynns,

Thank you so much!
I never know about Autohauz Arizona.

I purchased the voltage regulator.
It is so cheap, I think I can not purchase it in japan.

I will ask about replace regulator to electric shop.

Thank you very much again.

regards.

 

Masaki-san,

Please come back and let us know what part ends up fixing your car. It may be a simple voltage regulator or a rebuilt alternator.

 

If the running voltage doesn't drop below the battery, the regulator is likely defective. Generally speaking, of course. If the voltage running drops below the battery, it is sometimes a very strong indication of a dead alternator.

I've also had insufficient charging when some sort of tarry substance, likely the insulating material on my valeo regulator, flowed under heat and fouled the brushes and slip rings. I used electronics cleaner on it, and the brushes popped out of the housing, revealing some good life left, and the slip rings were cleaned. Everything has been back to normal since.

I would still like to swap out my regulator, but the dealer is charging a fortune for the valeo type, and I contacted valeo and they seem to have a horrible breakdown in getting them out to the independents that claim would carry them.

 

Just a side line.
If your hood pad is braking up there is a possibility that some of the material can be sucked in by the alternator and you can guess what...........

Regards.
aam.

 

Dear aam.

My food pad is copletery crean.
So I never worrie about it.
Thank you.

 

Hi, every one.

About my alternator dead problem, New Voltage regulator just arrived to my home.

Does any one know how to remove the alternator?

Is it difficult or easy?

Once I removed the alternator from 1994 mustang, it was not difficult.
How about the R129 SL320?

If you know same kind of thread, please inform to me.

Thank you very much.

Best regards.

 

Sorry.

In my previous thread, Mr. lynns give the information about remove the alternator by pdf.

I will try to remove the alternator tomorrow.

 

The hardest thing is to remove the belt and tensioner.
The rest is classic.
Lucky you you have more room to work.
Regards.
aam.

 

It was not voltage regulator

Dear everyone,

Today I done about voltage regulator change.
But alternator not making the electric.
Warning lamp also lit.

I thing it is not voltage regulator. it is rectifier of alternator or alternator another failure?

 

Dear everyone,

Today I done about voltage regulator change.
But alternator not making the electric.
Warning lamp also lit.

I thing it is not voltage regulator. it is rectifier of alternator or alternator another failure?

Masaki-san, please see if you can purchase a 12 Volt Battery/Alternator Tester for $5.87

 

replacing the voltage regulator is usually the problem but it could be the alternator or a wire came loose/broke on the alternator, or the items you mentioned.

are you doing the work yourself or paying someone?

 

Dear aam.

I've done the voltage regulator change.

It was so easy cause I could access to back of alternator only by remove the airfilter box.

But alternator not produce the electric...

I think it is rectifier or another alternator parts...

It is difficult...

Does anyone know rectifier selling shop?
I could not find it in autohauz AZ and rockauto.

 

Does anyone know rectifier selling shop?
I could not find it in autohauz AZ and rockauto.

I think you will need to buy a rebuilt Alternator but you need to check your current alternator with the above tool.

BTW, I think I am going to Merge the two threads into one instead of having two Threads.

 

lynns-san,

>BTW, I think I am going to Merge the two threads into one instead of having two Threads.

sorry for make 2threads.

 

Dear bearone2,

Yes, I did it by myself.

 

Dear Masaki.
When you installed the regulator did you clean the rotor in the alternator?
Clean it with a piece of fine emery paper. It is like sand paper.
(They are the brass tongs that the regulator carbon brushes rid on.)

Installing the new regulator sometimes is not going to cut it,
trouble shooting the problem is.

After you do that, you must take voltage readings to see what is going on.

It is also possible that you have wire problems.
You must trouble shoot the whole charging system.
Also CK your ground straps.
Especially the one by the starter.
Also run a temporary heavy ground wire from the body to the engine.

They most likely cure the problem but not the disease.

Regards.
aam.

 

Dear aam,

I'd checked the brus tongs, It was clean so I did nothing.

Today, I'd connected the lead wire to alternator + and -, and engine run.
But it was 0v.

I think it means alternator dead.
I will change to the rebuilt alternator.

regards.

 

You should try on the battery pols engine off take measurement.
Engine on again, it should be higher then with engine off.
The alternator needs battery voltage to kick on.
Don't forget the wiring.
Well try an other alternator, good luck.
Regards.
aam.

 

R&R of alternator on 113 engine

See attached PDF's.