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Low voltage

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oortiz

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Hello New to web site. I have a 1994 175 Johnson fast strike with low voltage. Only putting out 11.8 volts anyone ever have this issue? And any suggestions to check or replace?
 
First step is to clean all of the electrical connections under the hood with electrical cleaner and put back together with dielectric grease. Sand all the grounds metal to metal including components that use the mount bolt as a ground.
 
Sounds like a stator or reg/rect problem. Check to see if you have voltage on purple wire at reg/rect with key on as this is what turns it on/off.
 
Stator issues effect the voltage output? What about ignition issue? My boat runs fine and doesn't have any miss fire. I thought stator was for ignition control or does it do both?
 
Your stator does both charges the battery and provides power to the motor. They are separate systems so even if the charging part goes out the motor will still run. I would bet the rectifier went bad it happens.
 
Last question if stator is bad? Would it still put out voltage? My boat currently is putting out 11.8 which is low could it still be a stator issue or voltage regulator issue?
 
Yes have tach and yes it works then shuts off. I did charge battery up and took boat out all gauges worked fine. However voltage was still low output.
 
oortiz said:
Yes have tach and yes it works then shuts off. I did charge battery up and took boat out all gauges worked fine. However voltage was still low output.
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(Testing Tachometer With Water Cooled Regulator/Rectifier)
(J. Reeves)

A quick check is to simply plug in a another new tachometer as a piece of test equipment. If the new tach works properly and the old tach didn't, obviously the old tach is faulty.... but usually boaters don't carry around a spare tach (see below).

A faulty rectifier wouldn't damage the tachometer, the tachometer simply wouldn't work. This is due to the fact that the tachometer operates off of the charging system and the rectifier converts AC voltage to DC voltage, enabling the charging system. A faulty rectifier disables the charging system, and the tachometer simply doesn't register.

However.... those water cooled regulator/rectifiers that are used on the 35 ampere charging systems (and some others) bring into play a different type problem, and as you've probably found out, they are really a pain to troubleshoot via the proper procedure. There's an easier way.

The tachometer sending/receiving setup operates off of the gray wire at the tachometer. That same gray wire exists at the engine wiring harness which is connected to the engine electrical terminal strip. You'll see that there is a gray wire leading from the regulator/rectifier to that terminal strip, and that there is another gray wire attached to it. That other gray wire is the wire leading to the tachometer which is the one you're looking for.

NOTE: For the later models that DO NOT incorporate a wiring terminal strip, splicing into the "Yellow Wire" mentioned will be necessary.


Normally the Gray wire leading from the tachometer is attached at the terminal strip to another Gray wire which leads from the water cooled voltage regulator/rectifier...... remove the gray wire that leads to the tachometer. Now, find the two (2) yellow wires leading from the stator to that terminal strip. Hopefully one of them is either yellow/gray or is connected to a yellow/gray wire at the terminal strip. If so, connect the gray wire you removed previously to that yellow/gray terminal. Start the engine and check the tachometers operation, and if the tachometer operates as it should, then the regulator/rectifier is faulty and will require replacing. If the tachometer is still faulty, replace the tachometer.

If neither of the yellow wires from the stator is yellow/gray, and neither is attached to a yellow/gray wire, then attach that gray tachometer wire to either yellow stator wire, then the other yellow wire, checking the tachometer operation on both connections.

I've found this method to be a quick and efficient way of finding out which component is faulty.... the tachometer or the regulator/rectifier. It sounds drawn out but really only takes a very short time to run through. If the water cooled regulator/rectifier proves to be faulty, don't put off replacing it as they have been known to catch on fire with disastrous consequences.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
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