Missing voltage regulator

Swifty · 14 January 2005, 08:18

I have a Merc 90 (3 cyl) and its missing the voltage regulator.

Anyone know what the alternator output is rated at in amps?

Ian Austin · 14 January 2005, 08:39

Quote:

Originally Posted by Swifty

I have a Merc 90 (3 cyl) and its missing the voltage regulator.

Anyone know what the alternator output is rated at in amps?

Swifty
How old is the motor

Swifty · 14 January 2005, 18:08

Its a mid nineties model. Exact year unknown. Engine cover is the clam shell type.

Serial no. 0B971478
or
B371473

Tim.

Turbodiesel · 14 January 2005, 19:13

Im taking a guess that its the 9amp output stator that yours has. But i would need to check when im at work for definate.

Ian Austin · 15 January 2005, 22:04

Quote:

Originally Posted by Swifty

Its a mid nineties model. Exact year unknown. Engine cover is the clam shell type.

Serial no. 0B971478
or
B371473

Tim.

Swifty

The stators were changed and are now fitted with a 16 amp stator ( red ) the origonal one's are black, the black one's are not available anymore, so if you need a replacement regulator get the higher rated one as if you need to replace the stator later you will not have to replace the regulator.

Swifty · 16 January 2005, 16:29

Thanks for that. Just been out and had a look. The flywheel is red and the stator coils are black. So it sounds like a 9 amp.

Turbodiesel · 17 January 2005, 07:31

The part you need is.... Part number 815279A2. Not cheap either!!.

Swifty · 17 January 2005, 08:48

Go on then, i'm sitting down, how much...

Turbodiesel · 17 January 2005, 12:52

Quote:

Originally Posted by Swifty

Go on then, i'm sitting down, how much...

Ok this is Recomended Retail so you might be able to get it cheaper.......

£216.67

Hope your still sitting down!!

Matt · 17 January 2005, 13:31

Is it actually a regulator or just a rectifier?

Swifty · 17 January 2005, 14:34

Not any more, flat on the floor. Gosh thats alot. May have to look at plan B. I will have to design and build one.

Many thanks guys,
Tim.

Pete7 · 17 January 2005, 15:47

Or make some phone calls, unless Matt can build one or repair it.

http://www.boatsandoutboards.com/view/BEM145/

http://www.billhigham.co.uk/a_html/intro.htm

Pete

Turbodiesel · 17 January 2005, 20:59

Quote:

Originally Posted by MadMat

Is it actually a regulator or just a rectifier?

Its both! they call it the "Regulator rectifier".

Matt · 17 January 2005, 21:55

On my old Merc 150 V6 with a 16amp stator, it just had a rectifier. When it failed, I replaced it with a bridge rectifier from RS. Since this is only a 9 amp stator, I'm wondering whether a 5 quid rectifier might also be a good substitute here too.

Swifty · 18 January 2005, 09:18

Lead acid batteries require a constant voltage (13.8-14.2) to charge. As it reaches full charge it should float at the charge voltage. On mine the battery voltage rises to 16.5v after about 5 minutes. It has a small diamond shaped pack which is the rectifier and given the fact it stays at 16.5v may have a regulator built in or may be the peak voltage output of the alternator. Not sure.
One thing is for certain after a long run the battery gets really quite warm and gasses off quite actively.
I have been thinking about this and I am going to design and build one with a 20 amp capacity (200% rating) at 13.8v using a PWM regulator. Tricky bit is making it small enough to fit.
Before I do I will enquire at B&O.