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70 evinrude not charging

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dcutt1

New member
Hi folks,
I have a 83 70 evinrude I just bought,
ran fine on the trailer but on the first seatrial it cut out 1 cylinder after 15 min, also tach went out and not charging apparently. I redid (before seatrial)house wiring bilge/lights etc and noticed purple wire from engine harness not connected, (the grey and black were onthe tach. Also noticed rrectifier was veryhot 2 hours later after back from running it, disconnected battery???????
 
was the tach working and the
battery charging when you first went out and stopped working or have they not worked at all since you did the wiring?

are you saying the rectifier was hot 2 hours after you killed the motor and the motor was cooled off?if so you probably have a wiring error....disconnect everything that is hooked to the ignition battery and see if you still have the problem...

when you disconnect the battery or connect the battery look closely for a small spark...if you see anything then something is drawing current..this is wrong...
 
Before checking the rectifier, make sure that the voltage applied to the red wire is the proper polarity (12v +).

(Small Rectifier Test)
(J. Reeves)

Remove the rectifier wires from the terminal block. Using a ohm meter, connect the black lead of the ohm meter to the rectifier base (ground), then one by one, connect the red lead of the ohm meter to the yellow, yellow/gray, then the red wire (some rectifiers may also have a fourth yellow/blue wire. If so connect to that also). Now, reverse the ohm meter leads and check those same wires again. You should get a reading in one direction, and none at all in the other direction.

Now, connect the black lead of the ohm meter to the red wire. One by one, connect the red lead of the ohm meter to the yellow, yellow/gray, and if present, the yellow/blue wire. Then reverse the leads, checking the wires again. Once more, you should get a reading in one direction and none in the other.

Note that the reading obtained from the red rectifier wire will be lower then what is obtained from the other wires.

Any deviation from the "Reading", "No Reading" as above indicates a faulty rectifier. Note that a rectifier will not tolerate reverse polarity. Simply touching the battery with the cables in the reverse order or hooking up a battery charger backwards will blow the diodes in the rectifier assy immediately.

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Tach was working before I repaired house wiring, also seemed to be charging point 1 or 2 volts above nominal battery voltage. Didnt notice tach not working till on water, then relized I wasnt charging at all. Top cylinder cutout, thought maybe fuel issue because it sometimes would fire and go but only briefly. then when engine was off for neary 2 hours noticed rectifer was hot and I disconnected battery
 
I dont have volt meter here, but juices coming out of rectifier, also wondering if purple wire under dash has something to do with it?
 
Ok, rectifier test showed bad rectifier. Also there is power to red rectifier wire when key is off or on. Assuming bad key switch??? im hoping stator isnt shot
 
the 12 volts to the red wire is present whenever the battery is hooked up...it does not come through the switch....
 
http://ww2.justanswer.com/uploads/jacksparrow1956/2011-06-05_215955_omc_key_switch.jpg.......this is a switch wiring diagram...note the purple wire you are worried about...

when you put the new rectifier in check to make sure there is no draw from the battery as you did before....if it is still there disconnect the red wire on the rectifier output..if the draw is still there fix that before you hook the red wire back up...if it is not there before you disconnect the red wire the rectifier was probably shorted and you can proceed safely without damaging anything..

if there is a wiring error the objective is to find the error without damaging anything...just dont get frustrated...human errors are the hardest to find because there is no logic involved in the problem...just take your time and check and double check...

i would like to repeat one thing...if you draw a spark(any spark at all) when you connect or disconnect the battery with the key off then something is wrong...
 
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