1975 evinrude 115

[crestlinermusky]

I was originally told when I got the boat that the motor, a 1975 Evinrude 115 had a charging system on it, but am now wondering about that because the battery goes down
after 5 or 6 starts. It is a new battery,so either there is no
charging system or something is drawing too much power.
Pls let me know

 

[Haffiman]

Re: 1975 evinrude 115

Hook up a voltmeter to the battery and check.
A fully charged battery should hold about 12.8 Volts.
When engine running at 1500, min 13,5 Volts.

 

[emdsapmgr]

Re: 1975 evinrude 115

All V4 models that year had a rectifer, which means the engine will recharge the battery when it is running. The only thing the battery does in the electrical system is to run the starter, maybe 20 seconds. When the engine is running, the ignition system makes it's own power, so the battery is not really "required" (except to accept the charge from the rectifier.) If the battery runs down easily, a couple of things to check. You may have a draw on the battery from another source-like the radio or bilge pump. You can check for any type of extraneous draw with a simple voltmeter. It is also possible the rectifier is not working. If you have an engine tach and it appears to be malfunctioning (not reading correctly,) that is a likely sign the rectifer is not working properly and is probably not recharging the battery. It is an easy replacement.

 

[Joe Reeves]

Re: 1975 evinrude 115

(Small Rectifier Description & Location)
(J. Reeves)

On most 2,3,4,6 cylinder engines, the small rectifier is located on the starboard (right) side of the engine just in front of the engines electrical wiring strip. There are a few older V4 engines that have the wiring strip on the rear portion of the engine and the rectifier would be located just under that terminal strip. The smaller horsepower engines usually have the rectifier located on the starboard side of the powerhead close to the carburetor area.

The rectifier appears to be a round object approximately one inch (1") in diameter and also about one inch (1") high. The base of it is sort of triangular in appearance and is attached to the engine with two (2) screws/bolts..... usually one screw/bolt is larger than the other. The rectifier, depending on which one your engine uses, will have either:

One Red wire, one Yellow wire, and one Yellow/Gray wire, or One Red wire, and two Yellow wires.

Note that either of the above rectifiers could have a fourth wire which would be Yellow/Blue

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:

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********************
(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.

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