B230FD Problems :)

[Volvo940GL]

Originally Posted by Laird Scooby

It can probably be fixed but you need to check the earth strap from alternator to engine first. That would cause the symptom you're getting, as would a duff rectifier inside the alternator.

That's without any other faults that may come to light when it's stripped down so there may be other faults causing the symptoms, not limited to but including a worn or incorrect drive belt, incorrect tension on the belt and several others.

I'm a few thousand miles away and can not see exactly what it's doing, however the fact the charge warning light and the others that are linked to it when the alternator isn't charging are on, even dimly points to an alternator fault so it's not charging. Could explain the flat battery!

Also if the engine management ECU doesn't see the correct charging voltage, it will throw everything out of kilter and cause among other things, rough running, misfires and umpteen other possible problems!

Battery shows 12.71V while engine is off
Alternator shows 14,05
And battery shows 14.05
When engine almost stalls it shows 13.85v

Did another test
Battery 12,7volt
Alternator between 13.85-14.05v
Battery shows 13-85-14.20v
3000rpm It shows 14,5 volt
I cleaned ground and that big and small red cable behind the alternator. I did ofc remove minus pole from the battery

Alternator is 62a right?

Can I upgrade to 100a?


That regulator is new aswell

[Laird Scooby]

Have you got a photo of the back of the alternator and one of the label on the side showing the numbers without black ink all over it? Can't make out the details i need to see because of the black ink. Also looking at the back of the alternator, the wiring looks wrong! Need to see what it is so i can either confirm it as right or wrong.

[Volvo940GL]

Originally Posted by Laird Scooby

Have you got a photo of the back of the alternator and one of the label on the side showing the numbers without black ink all over it? Can't make out the details i need to see because of the black ink. Also looking at the back of the alternator, the wiring looks wrong! Need to see what it is so i can either confirm it as right or wrong.

Here you go

[Laird Scooby]

Originally Posted by Volvo940GL

Here you go

That's a generic Bosch remanufactured unit, 65A output. What about the photo of the back of the alternator so i can see the conections?

[Volvo940GL]

Originally Posted by Laird Scooby

That's a generic Bosch remanufactured unit, 65A output. What about the photo of the back of the alternator so i can see the conections?

here you go

[Laird Scooby]

That's all correct so points to a definite alternator fault if the chage warning light isn't going out completely.

[Volvo940GL]

[QUOTE=Laird Scooby;2600545]That's all correct so points to a definite alternator fault if the chage warning light isn't going out completely.[/QUOTE

So alternator isn’t the case? Alright.
But isn’t a good generator supposed to charge 14,5 volt minimum? I’ve got 14v

[Laird Scooby]

Originally Posted by Volvo940GL

So alternator isn’t the case? Alright.
But isn’t a good generator supposed to charge 14,5 volt minimum? I’ve got 14v

Originally Posted by Laird Scooby

That's all correct so points to a definite alternator fault if the chage warning light isn't going out completely.

points to a definite alternator fault



How many more ways can i say it??? The alternator is FAULTY!!!!!

[aardvarkash10]

Dave is correct - the alternator warning light on the dash is a part of the charging system.

A couple of things to confirm Dave's diagnosis please.

Start and run the car with the headlights on, heater fan running, stereo on, any other electrical thing on that you can get.

With your multimeter set to Volts DC, put the positive lead of the meter on the alternator output terminal (the big red wire) and the negative lead of the meter on the battery positive terminal.

Bring the engine up to about 2,000rpm, and read the voltage on the meter. It should be less than 0.5v.

Switch everything off, and then come and tell us what teh reading on your meter was. Do nothing else.

[Volvo940GL]

Originally Posted by aardvarkash10

Dave is correct - the alternator warning light on the dash is a part of the charging system.

A couple of things to confirm Dave's diagnosis please.

Start and run the car with the headlights on, heater fan running, stereo on, any other electrical thing on that you can get.

With your multimeter set to Volts DC, put the positive lead of the meter on the alternator output terminal (the big red wire) and the negative lead of the meter on the battery positive terminal.

Bring the engine up to about 2,000rpm, and read the voltage on the meter. It should be less than 0.5v.

Switch everything off, and then come and tell us what teh reading on your meter was. Do nothing else.

I’ll check tomorrow
Thanks