I have a 1985 Evinrude 90hp V4 outboard. It is charging at an idle,
but falls off when you apply power. Can someone tell me where to begin
looking? Should i be looking at the rectifier or some place else?
Thanks -Rick

wrote:
I have a 1985 Evinrude 90hp V4 outboard. It is charging at an idle,
but falls off when you apply power. Can someone tell me where to begin
looking? Should i be looking at the rectifier or some place else?
Thanks -Rick


What is the model # & year?

How do you know it's charging at idle, & not otherwise?

Please provide voltage/amperage readings, and where you took them, so we
can help you out.

Rob

trainfan1 wrote:

What is the model # & year?

How do you know it's charging at idle, & not otherwise?

Please provide voltage/amperage readings, and where you took them, so we
can help you out.

Rob

It is a 1985 90hp V4 crossflow flow engine design. I have not gotten
any readings as of yet. The RPM gauge works fine at an idle, but falls
to 0 when power is applied. I was told by a marine guy (?) that this
is an idication of the charging system not working under power. He
indicated that it was most likey the rectifier. Before is started
digging and pulling the flywheel, i was looking for a second opinion,
or direction.

-Rick

that ddoesn't sound like a charge problem. it sounds like a tach or
connection problem.

To find out if the charging system is bad, put a volt meter of some
sorts across the battery posts while the negine is running. you should
have at high idle approx 13.6-14.1 volts.




wrote:
trainfan1 wrote:

What is the model # & year?

How do you know it's charging at idle, & not otherwise?

Please provide voltage/amperage readings, and where you took them, so we
can help you out.

Rob

It is a 1985 90hp V4 crossflow flow engine design. I have not gotten
any readings as of yet. The RPM gauge works fine at an idle, but falls
to 0 when power is applied. I was told by a marine guy (?) that this
is an idication of the charging system not working under power. He
indicated that it was most likey the rectifier. Before is started
digging and pulling the flywheel, i was looking for a second opinion,
or direction.

-Rick

wrote:

trainfan1 wrote:

What is the model # & year?

How do you know it's charging at idle, & not otherwise?

Please provide voltage/amperage readings, and where you took them, so we
can help you out.

Rob


It is a 1985 90hp V4 crossflow flow engine design. I have not gotten
any readings as of yet. The RPM gauge works fine at an idle, but falls
to 0 when power is applied. I was told by a marine guy (?) that this
is an idication of the charging system not working under power. He
indicated that it was most likey the rectifier. Before is started
digging and pulling the flywheel, i was looking for a second opinion,
or direction.

-Rick


Disconnect the rectifier and check the AC output of the alternator coils
under running conditions. If it checks out OK, rectifier/regulator
failure is usually indicated.

The tach works by counting the pole pulses of the alternator(AC). You
want to eliminate all components outside of the flywheel before having
to remove it.

Rob

trainfan1 wrote in news:67ydnQvKCdi2
:

You
want to eliminate all components outside of the flywheel before having
to remove it.


Wait until he sees what they want for a new stator to replace that rusty
old thing inside the flywheel with the rotten core that's shorting out the
magnetism. It's like replacing the V-8 in a Lexus....(d^


Been there, replaced that, 175 Merc V-6

Before he puts the new stator in it, make him coat all those exposed soft
iron cores around the flywheel with axle grease to stop the corrosion, LIKE
THE DAMNED MANUFACTURER SHOULD HAVE DONE AT THE FACTORY IN THE FIRST PLACE!

When the core rots, it expands with rust and pulls the coils apart.
Planned obsolescense?

--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.

Larry wrote:
trainfan1 wrote in news:67ydnQvKCdi2
:


You
want to eliminate all components outside of the flywheel before having
to remove it.



Wait until he sees what they want for a new stator to replace that rusty
old thing inside the flywheel with the rotten core that's shorting out the
magnetism. It's like replacing the V-8 in a Lexus....(d^


Been there, replaced that, 175 Merc V-6

Before he puts the new stator in it, make him coat all those exposed soft
iron cores around the flywheel with axle grease to stop the corrosion, LIKE
THE DAMNED MANUFACTURER SHOULD HAVE DONE AT THE FACTORY IN THE FIRST PLACE!

When the core rots, it expands with rust and pulls the coils apart.
Planned obsolescense?


Sorry you had such a hassle w/ the Merc, but OMC types are not as prone
to stator failure as the Mercury outboards. Parts are pretty easy to
come by, too. I think the problem will be found w/o pulling the flywheel.

Rob

wrote:
I have a 1985 Evinrude 90hp V4 outboard. It is charging at an idle,
but falls off when you apply power. Can someone tell me where to begin
looking? Should i be looking at the rectifier or some place else?
Thanks -Rick

Are you sure your rectifier is under the flywheel? I've got an older
135hp V4 (ten years older!) but the rectifier on it is on the block.

Are you sure your rectifier is under the flywheel? I've got an older
135hp V4 (ten years older!) but the rectifier on it is on the block.

Thanks for all the postings. I am pulling the boat back to the house
on Thursday and will begin checking the items suggested.

The rectifier is under the flywheel on this model with tilt and trim.

I will post updates this weekend. Again, thanks for the suggestions!
-Rick

Captn' Rick wrote:

Are you sure your rectifier is under the flywheel? I've got an older
135hp V4 (ten years older!) but the rectifier on it is on the block.

Thanks for all the postings. I am pulling the boat back to the house
on Thursday and will begin checking the items suggested.

The rectifier is under the flywheel on this model with tilt and trim.

I will post updates this weekend. Again, thanks for the suggestions!
-Rick

Bummer! Mine takes about 5 minutes to change!