No Voltage Regulator on '90 Black Max 135?

[MikeV4]

A fried Humminbird transducer (not a big waste) made me check the output voltage; 17V at higher revs. This made me think that both my voltage regulators are gone, but I can't find any voltage regulators on neither one of the engines. Are there any models build without thr VR? The parts catalogue shows a VR.

 

[ricksrster]

Re: No Voltage Regulator on '90 Black Max 135?

The regulators have two yellow, one red, and one gray wire connected to them.

 

[j_martin]

Re: No Voltage Regulator on '90 Black Max 135?

It ain't a regulator, just a bridge rectifier. The battery has to be good and kept up on water to hold the voltage down. Pretty sophomoric electrics on such an expensive motor.

You can retrofit a regulator. I think cdi 194-5279 will work. You have to cut and crimp, but the color codes are right.


John

 

[Texasmark]

Re: No Voltage Regulator on '90 Black Max 135?

Don't agree J. The module, at least in '94 and on, is a combo rect-regl, and I can't possibly believe that they would come out with a new engine design in the '89-90 time frame (3 cyl 90 hp) and not have a regulator in it since they had one in it's I6 predecessor (had a '89 115 with it) and turn right around 4 years later and add it back. Amperage of the alternator is too big. For the little 2 cylinder fishing engines (25 hp and below), they can get away with it, but not on the big boys with up to 16 amperes out of the charging ckt.

Yellows are AC input from the stator, gray is tach signal out, and one or 2 reds for dc out. Ground is via the case to the engine block.

Mark

 

[andy6374]

Re: No Voltage Regulator on '90 Black Max 135?

My 89 200hp engine was factory installed with a 9 amp stator as were many, however some had 15 or 16 amp stators. The 9 amp stators don't require a voltage regulator and you'll just have a rectifier which is diamond shaped with three posts on it. Like said above one post will have a red wire, the other will have grey and yellow, the other will have just plain yellow.

From the 80's to early 90's, if there was a voltage regulator (for the 16 amp stators) it was a seperate unit from the rectifier. What's your serial number so I can check for sure?

But if you are overcharging, it could be:
- that your connections at the battery are not tight
- The battery is on its way out the door.
- Loose connections at the rectifier
- The resistance in the stator charging coils can change over time resulting in an overcharge.


When I replaced my stator 2 summers ago,it overcharged. So I used the CDI/Rapair rect/reg. combo 194-5279.

When replacing any ignition component on a merc, go with CDI/Rapair as they are much better than OEM.

 

[Texasmark]

Re: No Voltage Regulator on '90 Black Max 135?

Andy, you gotta be Shi.....ing me. A 200 hp built in '89 with a 9 amp alternator and no regulator.

Sorry but I ain't buying that sucker.

Mark

 

[andy6374]

Re: No Voltage Regulator on '90 Black Max 135?

Sorry but I ain't buying that sucker.

Mark

Are you saying you don't believe me? Or rather that you are beside yourself that Mercury was selling 200hp engines in 88' with 9 amp charging systems?


When the stator dies, which it will, you can always replace it with a 16 amp stator from CDI/Rapair and retrofit a rect/reg. combo.

 

[Texasmark]

Re: No Voltage Regulator on '90 Black Max 135?

Well, if you have the engine if front of you, it's hard to dispute facts.

But Merc has always been a pioneer in having the highest output alternators. I don't have a Merc book past '94 which has a 40 a alternator in the 200 hp engines. I had an '89 I6 115 but don't remember what it's capacity was.

No biggie, I'm just blowing hot air..........yes, I'm beside myself; can't you tell? d

Mark

 

[j_martin]

Re: No Voltage Regulator on '90 Black Max 135?

I have an 88 with just a diode, probably 16 amp system. In the parts list, the diode part number is not listed (na) , and the regulator part number 88825a-7, which I think is just a sink it to ground type regulator. It is on top of the motor, and 2 wires go to, one of the yellow stator leads, and a red lead.

It's a pos system that barely keeps up the main battery in short runs, and cooks it when water skiing.

many 9 and 16 amp systems don't have the "regulator".

I guess the idea is that the charge coils run the ignition, and who needs running lights.

It's coming out, and at a dual reg 40 system is going in before spring.
John

 

[Laddies]

Re: No Voltage Regulator on '90 Black Max 135?

Not trying to dispute anyone, but I think the confusion here is caused by some manuals saying that the rectifier was used on only the 9 amp system, not true the rectifier was used by Mercury on V/6s in 90 and 91 on 16 amp systems as a cheap a$$ deal and I think thats where the confusion is, not misinformion by a person just a fact that has been passed over in a lot of manuals in late years---Bob

 

[Texasmark]

Re: No Voltage Regulator on '90 Black Max 135?

I think you hit it Laddies. I can certainly understand what j is talking about in frying parts while water skiing.

The boy's '95 150 has the dual regulators. They have 2 separate stators (4 yellow leads ) and 2 go to each regulator. Tach output is only used on one; the other is unterminated.

One thing to keep in mind j, ground for the unit is the case (so you need a good connection there) and since you are rectifying and regulating, considerable heat can be generated that must be removed. The alum case needs to be tied good to the block or other heat sinking component and a little thermal grease between the two surely wouldn't hurt. The boy's is mounted to the exhaust manifold cover right between the cylinder banks. The bracket with the ignition coils and trim relays mounts directly over it.

Mark