HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

heebeha · Apr 27, 2011

I bought a new diode because my engine keeps going inot SLOW mode after it sets for a while. I think the Diode is bad, I have changed the powerpack, spark pluf wires, both temp sensors, I cant find any wires grounding so I am thijking its the $12 diode causing the issue but I cant find it in the harness.

I took some photos, hoping someone has chnaged theirs or knows where the diode is before I open all the shrink wrapped wires.

Help please... I want to get her in the water this week.

Thanks in advance.
JD

heebeha · Apr 27, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

Here is one more image

boobie · Apr 27, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

Measure 5 1/2 " from the edge of the big red connector on the mtr wiring harness and open the harness there. It will be attached to tan wires.

heebeha · Apr 28, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

boobie said:
Measure 5 1/2 " from the edge of the big red connector on the mtr wiring harness and open the harness there. It will be attached to tan wires.

The only tan wires in the harnessa are these ones and they connect to each other. Is that correct. The diode is in between the tan wires?

jonesg · Apr 28, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

I wrote in my manual a while back, "diode located 1 1/2 inches from cannon plug."
Keep digging, its in there.

boobie · Apr 28, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

I got my info from an OMC service bulletin. You don't count the cannon plug in your measurement. Just from the edge of it where it goes into the harness.

heebeha · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

jonesg said:
I wrote in my manual a while back, "diode located 1 1/2 inches from cannon plug."
Keep digging, its in there.

What manual is this sir? Can you send it to me please.
Are you saying one side of the diode has wires that are white and the other side has wires that are tan

Big flop · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

You can ohms test the diode to see
if it is working
It should only have conninuity in only
one direction

hidef · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

Do you have the OMC service manual. If you don't you can order it from www.marineengine.com

heebeha · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

I cant find the diode to test it.
I have the manual but cant find any info on the diode

Big flop · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

You don't remove it for the test, it stays hooked
up in the harness while testing.

hidef · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

http://www.marineengine.com/parts/j...manufacturer=Evinrude&section=Ignition+System

It is item 26. I would say it is an 1 1/2 inches from the big red cannon plug.

Big flop · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

Yes that is it.
From the big red plug follow the tan wire and if
there are no connectors till the tan wires your holding
with the heat shrink then it's probably inside it.

Big flop · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

You said it's going into slow?
Over 2000 RPM shakes real hard ?

jeffersondodson561 · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

Follow these instructions, I would recommend wherever you see "ohmeter" in testing the diode in the directions, use you diode test on your multimeter.

Here is the location of the diode your looking for

Big flop · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

That's the diode test for the shift.
I think he's looking for the brown
wire warning system diode?

jeffersondodson561 · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

I would check both switch operation and diode though, I think that the shift switch cuts 3 cylinders which can be mistaken for S.L.O.W.

heebeha · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

Big flop said:
You said it's going into slow?
Over 2000 RPM shakes real hard ?

Exactly, till she warms up then she runs like a champ. Thats why i figured it was the temperature sensors. I had to dig out the starboard sensor. I havent ran the engine yet, it runs fine at home, its in the water aftr it ran for a while then I stopped and started it again that I had the issue. Someone said it might be that diode so I wanted to just fix everything it could possibly be.

clanton · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

If you have not found the diode yet. It has 3 tan wires in and 3 tan wires out You had your finger on it in the third photo. All you have to do is disconnect the tan wire from the 2 temp sensors for a test, still have the problem disconnect the shift switch. Still have the problem time for ignition testing with peakreading meter. Photos take me longer,

Big flop · Apr 29, 2011

Re: HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

It can go into slow from a bad temp switch,
Going into slow from a different warning system
then it may be a bad diode.
Low oil, no oil, fuel vacume switch or
a ground returning from warning horn.
And as stated in reply #17 don't rule out the shift switch.
but a bad shift switch won't make it shake at 2000 RPM
It will just run like a dog.

HELP finding my Diode on my 1993 150HP 60 degree Looper Ocean Pro

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